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x in (-oo:+oo)
(-1/6)*(x+18)+(1/3)*(x+3) = x+19 // - x+19
(-1/6)*(x+18)+(1/3)*(x+3)-x-19 = 0
1/3*(x+3)-1/6*(x+18)-x-19 = 0
1/3*(x+3)-1/6*(x+18)-x-19 = 0
1/6*x-x-19-2 = 0
-5/6*x-19-2 = 0
-5/6*x-21 = 0
-5/6*x-21 = 0
-5/6*x-21 = 0 // + 21
-5/6*x = 21 // : -5/6
x = 21/(-5/6)
x = -126/5
x = -126/5
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