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(x+7)/3 = 4 // - 4
(x+7)/3-4 = 0
(x+7)/3+(-4*3)/3 = 0
x-4*3+7 = 0
x-5 = 0
(x-5)/3 = 0
(x-5)/3 = 0 // * 3
x-5 = 0
x-5 = 0 // + 5
x = 5
x = 5
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