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(2/3)*(9*x-6) = (1/4)*(12-(4*x)) // - (1/4)*(12-(4*x))
(2/3)*(9*x-6)-((1/4)*(12-(4*x))) = 0
(2/3)*(9*x-6)+(-1/4)*(12-4*x) = 0
2/3*(9*x-6)-1/4*(12-4*x) = 0
2/3*(9*x-6)-1/4*(12-4*x) = 0
7*x-7 = 0
7*x-7 = 0
7*x-7 = 0 // + 7
7*x = 7 // : 7
x = 7/7
x = 1
x = 1
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