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