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