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(3/4)*(5*x-4) = 12 // - 12
(3/4)*(5*x-4)-12 = 0
3/4*(5*x-4)-12 = 0
3/4*(5*x-4)-12 = 0
15/4*x-15 = 0
15/4*x-15 = 0
15/4*x-15 = 0 // + 15
15/4*x = 15 // : 15/4
x = 15/15/4
x = 4
x = 4
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