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(x+7)/3-1 = 0
(x+7)/3+(-1*3)/3 = 0
x-1*3+7 = 0
x+4 = 0
(x+4)/3 = 0
(x+4)/3 = 0 // * 3
x+4 = 0
x+4 = 0 // - 4
x = -4
x = -4
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