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(3/5)*(x-4) = 13 // - 13
(3/5)*(x-4)-13 = 0
3/5*(x-4)-13 = 0
3/5*(x-4)-13 = 0
3/5*x-77/5 = 0
3/5*x-77/5 = 0
3/5*x-77/5 = 0 // + 77/5
3/5*x = 77/5 // : 3/5
x = 77/5/3/5
x = 77/3
x = 77/3
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