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