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