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(x+7)/6 = 4 // - 4
(x+7)/6-4 = 0
(x+7)/6+(-4*6)/6 = 0
x-4*6+7 = 0
x-17 = 0
(x-17)/6 = 0
(x-17)/6 = 0 // * 6
x-17 = 0
x-17 = 0 // + 17
x = 17
x = 17
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