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(3/5)*(25*x+10) = 6*x+15 // - 6*x+15
(3/5)*(25*x+10)-(6*x)-15 = 0
(3/5)*(25*x+10)-6*x-15 = 0
3/5*(25*x+10)-6*x-15 = 0
3/5*(25*x+10)-6*x-15 = 0
9*x-15+6 = 0
9*x-9 = 0
9*x-9 = 0
9*x-9 = 0 // + 9
9*x = 9 // : 9
x = 9/9
x = 1
x = 1
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