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x in (-oo:+oo)
(-1/6)*(x-18)+(1/3)*(x+3) = x-6 // - x-6
(-1/6)*(x-18)+(1/3)*(x+3)-x+6 = 0
1/3*(x+3)-1/6*(x-18)-x+6 = 0
1/3*(x+3)-1/6*(x-18)-x+6 = 0
1/6*x-x+4+6 = 0
4-5/6*x+6 = 0
10-5/6*x = 0
10-5/6*x = 0
10-5/6*x = 0 // - 10
-5/6*x = -10 // : -5/6
x = -10/(-5/6)
x = 12
x = 12
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