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(4/5)*(2*x-1) = 12 // - 12
(4/5)*(2*x-1)-12 = 0
4/5*(2*x-1)-12 = 0
4/5*(2*x-1)-12 = 0
8/5*x-64/5 = 0
8/5*x-64/5 = 0
8/5*x-64/5 = 0 // + 64/5
8/5*x = 64/5 // : 8/5
x = 64/5/8/5
x = 8
x = 8
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