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(1/5)*(x-3) = 15 // - 15
(1/5)*(x-3)-15 = 0
1/5*(x-3)-15 = 0
1/5*(x-3)-15 = 0
1/5*x-78/5 = 0
1/5*x-78/5 = 0
1/5*x-78/5 = 0 // + 78/5
1/5*x = 78/5 // : 1/5
x = 78/5/1/5
x = 78
x = 78
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