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