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3*x-((3/4)*x) = 126 // - 126
3*x-((3/4)*x)-126 = 0
3*x+(-3/4)*x-126 = 0
9/4*x-126 = 0 // + 126
9/4*x = 126 // : 9/4
x = 126/9/4
x = 56
x = 56
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