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x in (-oo:+oo)
(-1/6)*(x-18)+(1/2)*(x+2) = x-20 // - x-20
(-1/6)*(x-18)+(1/2)*(x+2)-x+20 = 0
1/2*(x+2)-1/6*(x-18)-x+20 = 0
1/2*(x+2)-1/6*(x-18)-x+20 = 0
1/3*x-x+4+20 = 0
4-2/3*x+20 = 0
24-2/3*x = 0
24-2/3*x = 0
24-2/3*x = 0 // - 24
-2/3*x = -24 // : -2/3
x = -24/(-2/3)
x = 36
x = 36
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