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(5*x-7)/3 = -15 // + 15
(5*x-7)/3+15 = 0
(5*x-7)/3+(3*15)/3 = 0
5*x+3*15-7 = 0
5*x+38 = 0
(5*x+38)/3 = 0
(5*x+38)/3 = 0 // * 3
5*x+38 = 0
5*x+38 = 0 // - 38
5*x = -38 // : 5
x = -38/5
x = -38/5
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