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