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(3*x+7)/4 = -2 // + 2
(3*x+7)/4+2 = 0
(3*x+7)/4+(2*4)/4 = 0
3*x+2*4+7 = 0
3*x+15 = 0
(3*x+15)/4 = 0
(3*x+15)/4 = 0 // * 4
3*x+15 = 0
3*x+15 = 0 // - 15
3*x = -15 // : 3
x = -15/3
x = -5
x = -5
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