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(3*x-1)/4 = -7 // + 7
(3*x-1)/4+7 = 0
(3*x-1)/4+(4*7)/4 = 0
3*x+4*7-1 = 0
3*x+27 = 0
(3*x+27)/4 = 0
(3*x+27)/4 = 0 // * 4
3*x+27 = 0
3*x+27 = 0 // - 27
3*x = -27 // : 3
x = -27/3
x = -9
x = -9
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