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(3/4)*x-((1/2)*x)-4 = 12 // - 12
(3/4)*x-((1/2)*x)-12-4 = 0
(3/4)*x+(-1/2)*x-12-4 = 0
1/4*x-16 = 0 // + 16
1/4*x = 16 // : 1/4
x = 16/1/4
x = 64
x = 64
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