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(1/2)*(2*x-12) = (2/3)*(3*x+9) // - (2/3)*(3*x+9)
(1/2)*(2*x-12)-((2/3)*(3*x+9)) = 0
(1/2)*(2*x-12)+(-2/3)*(3*x+9) = 0
1/2*(2*x-12)-2/3*(3*x+9) = 0
1/2*(2*x-12)-2/3*(3*x+9) = 0
-x-12 = 0
-x-12 = 0
-x-12 = 0 // + 12
-x = 12 // * -1
x = -12
x = -12
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