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(3/5)*(2*x-15) = (1/5)*x // - (1/5)*x
(3/5)*(2*x-15)-((1/5)*x) = 0
(3/5)*(2*x-15)+(-1/5)*x = 0
3/5*(2*x-15)-x/5 = 0
(3/5*5*(2*x-15))/5-x/5 = 0
3/5*5*(2*x-15)-x = 0
5*x-45 = 0
(5*x-45)/5 = 0
(5*x-45)/5 = 0 // * 5
5*x-45 = 0
5*x-45 = 0 // + 45
5*x = 45 // : 5
x = 45/5
x = 9
x = 9
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