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(3/4)*(12*x-4) = 6*x-(2*x)+9 // - 6*x-(2*x)+9
(3/4)*(12*x-4)-(6*x)+2*x-9 = 0
(3/4)*(12*x-4)-6*x+2*x-9 = 0
3/4*(12*x-4)-6*x+2*x-9 = 0
3/4*(12*x-4)-6*x+2*x-9 = 0
3*x+2*x-9-3 = 0
5*x-9-3 = 0
5*x-12 = 0
5*x-12 = 0
5*x-12 = 0 // + 12
5*x = 12 // : 5
x = 12/5
x = 12/5
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