6777
1
=
77
−
76
2
=
7
−
(
6
−
7
7
)
3
=
6
7
+
7
7
4
=
6
−
7
+
7
7
5
=
77
7
−
6
6
=
7
−
(
7
−
6
)
7
7
=
(
7
−
7
)
⋅
6
+
7
8
=
77
−
6
−
7
9
=
67
+
7
+
7
10
=
77
−
67
11
=
77
⋅
6
!
7
!
12
=
67
+
77
13
=
7
−
(
7
−
6
)
+
7
14
=
77
+
7
6
15
=
7
−
6
+
7
+
7
16
=
?
17
=
77
7
+
6
18
=
67
−
7
⋅
7
19
=
?
20
=
7
⋅
7
+
6
+
7
21
=
7
!
6
!
+
7
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7
22
=
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23
=
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24
=
(
6
−
7
+
7
7
)
!
25
=
?
26
=
?
27
=
76
−
7
⋅
7
28
=
6
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7
−
7
−
7
29
=
7
!
6
+
7
7
30
=
?
31
=
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32
=
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33
=
?
34
=
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35
=
77
−
6
⋅
7
36
=
7
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7
−
6
−
7
37
=
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38
=
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39
=
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40
=
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41
=
6
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7
−
7
7
42
=
(
7
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(
7
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6
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7
43
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6
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7
44
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45
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46
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47
=
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48
=
7
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7
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6
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7
49
=
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7
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7
50
=
7
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7
−
6
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7
51
=
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52
=
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53
=
67
−
7
−
7
54
=
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55
=
7
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7
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7
+
6
56
=
(
7
−
6
+
7
)
⋅
7
57
=
777
−
6
!
58
=
?
59
=
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60
=
67
−
7
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7
61
=
?
62
=
76
−
7
−
7
63
=
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64
=
77
−
6
−
7
65
=
7
7
+
7
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−
6
66
=
67
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7
7
67
=
67
−
7
+
7
68
=
7
7
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67
69
=
76
−
7
⋅
7
70
=
77
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7
!
6
!
71
=
(
7
−
6
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7
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7
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72
=
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73
=
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74
=
7
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7
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67
75
=
76
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7
7
76
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76
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7
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7
77
=
7
7
+
76
78
=
77
−
6
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7
79
=
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80
=
?
81
=
67
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7
+
7
82
=
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83
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7
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7
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76
84
=
7
!
67
−
7
85
=
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86
=
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87
=
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88
=
?
89
=
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90
=
76
+
7
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7
91
=
(
7
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7
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6
+
7
92
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(
7
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7
)
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7
−
6
93
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94
=
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95
=
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96
=
?
97
=
?
98
=
(
6
+
7
)
⋅
7
+
7
99
=
?
100
=
?