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(1/2)*(6*x-4) = (2/3)*(x+9)+(1/3)*x // - (2/3)*(x+9)+(1/3)*x
(1/2)*(6*x-4)-((2/3)*(x+9))-((1/3)*x) = 0
(1/2)*(6*x-4)+(-2/3)*(x+9)+(-1/3)*x = 0
1/2*(6*x-4)-2/3*(x+9)-x/3 = 0
(1/2*3*(6*x-4))/3+(-2/3*3*(x+9))/3-x/3 = 0
1/2*3*(6*x-4)-2/3*3*(x+9)-x = 0
7*x-x-24 = 0
6*x-24 = 0
(6*x-24)/3 = 0
(6*x-24)/3 = 0 // * 3
6*x-24 = 0
6*x-24 = 0 // + 24
6*x = 24 // : 6
x = 24/6
x = 4
x = 4
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