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x in (-oo:+oo)
(-1/6)*(x-12)+(1/3)*(x+3) = x+18 // - x+18
(-1/6)*(x-12)+(1/3)*(x+3)-x-18 = 0
1/3*(x+3)-1/6*(x-12)-x-18 = 0
1/3*(x+3)-1/6*(x-12)-x-18 = 0
1/6*x-x-18+3 = 0
3-5/6*x-18 = 0
-5/6*x-15 = 0
-5/6*x-15 = 0
-5/6*x-15 = 0 // + 15
-5/6*x = 15 // : -5/6
x = 15/(-5/6)
x = -18
x = -18
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