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