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x in (-oo:+oo)
(-1/6)*(x-18)+(1/3)*(x+3) = x-26 // - x-26
(-1/6)*(x-18)+(1/3)*(x+3)-x+26 = 0
1/3*(x+3)-1/6*(x-18)-x+26 = 0
1/3*(x+3)-1/6*(x-18)-x+26 = 0
1/6*x-x+4+26 = 0
4-5/6*x+26 = 0
30-5/6*x = 0
30-5/6*x = 0
30-5/6*x = 0 // - 30
-5/6*x = -30 // : -5/6
x = -30/(-5/6)
x = 36
x = 36
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