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(1/2)*(2*x-6) = (-1/3)*(3*x+18) // - (-1/3)*(3*x+18)
(1/2)*(2*x-6)-((-1/3)*(3*x+18)) = 0
(1/2)*(2*x-6)+(1/3)*(3*x+18) = 0
1/2*(2*x-6)+1/3*(3*x+18) = 0
1/2*(2*x-6)+1/3*(3*x+18) = 0
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
x = -3/2
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