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(1/3)*(6*x+12)-18 = (-1/2)*(4*x-8) // - (-1/2)*(4*x-8)
(1/3)*(6*x+12)-((-1/2)*(4*x-8))-18 = 0
(1/3)*(6*x+12)+(1/2)*(4*x-8)-18 = 0
1/3*(6*x+12)+1/2*(4*x-8)-18 = 0
1/3*(6*x+12)+1/2*(4*x-8)-18 = 0
4*x-18 = 0
4*x-18 = 0
4*x-18 = 0 // + 18
4*x = 18 // : 4
x = 18/4
x = 9/2
x = 9/2
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