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(3/5)*(x-12) = 15 // - 15
(3/5)*(x-12)-15 = 0
3/5*(x-12)-15 = 0
3/5*(x-12)-15 = 0
3/5*x-111/5 = 0
3/5*x-111/5 = 0
3/5*x-111/5 = 0 // + 111/5
3/5*x = 111/5 // : 3/5
x = 111/5/3/5
x = 37
x = 37
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