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3*x-((3/4)*x) = 12 // - 12
3*x-((3/4)*x)-12 = 0
3*x+(-3/4)*x-12 = 0
9/4*x-12 = 0 // + 12
9/4*x = 12 // : 9/4
x = 12/9/4
x = 16/3
x = 16/3
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