11c - 7 = 70
11c - 7 + 7 = 70 + 7
11c = 77
11c / 11 = 77 / 11
c = 7
11c - 7 = 70
11c - 7 + 7 = 70 + 7
11c = 77
11c / 11 = 77 / 11
c = 7
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