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(2/5)*(x-8) = 4 // - 4
(2/5)*(x-8)-4 = 0
2/5*(x-8)-4 = 0
2/5*(x-8)-4 = 0
2/5*x-36/5 = 0
2/5*x-36/5 = 0
2/5*x-36/5 = 0 // + 36/5
2/5*x = 36/5 // : 2/5
x = 36/5/2/5
x = 18
x = 18
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