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(3/4)*(2*x-1) = 12 // - 12
(3/4)*(2*x-1)-12 = 0
3/4*(2*x-1)-12 = 0
3/4*(2*x-1)-12 = 0
3/2*x-51/4 = 0
3/2*x-51/4 = 0
3/2*x-51/4 = 0 // + 51/4
3/2*x = 51/4 // : 3/2
x = 51/4/3/2
x = 17/2
x = 17/2
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