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3*x+2*x+7/8 = -113/8 // + -113/8
3*x+2*x+7/8-(-113/8) = 0
3*x+2*x+7/8+113/8 = 0
5*x+15 = 0 // - 15
5*x = -15 // : 5
x = -15/5
x = -3
x = -3
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