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(3/4)*(3*x-8) = 12 // - 12
(3/4)*(3*x-8)-12 = 0
3/4*(3*x-8)-12 = 0
3/4*(3*x-8)-12 = 0
9/4*x-18 = 0
9/4*x-18 = 0
9/4*x-18 = 0 // + 18
9/4*x = 18 // : 9/4
x = 18/9/4
x = 8
x = 8
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