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x in (-oo:+oo)
(1/6)*(x-15) = x+20 // - x+20
(1/6)*(x-15)-x-20 = 0
1/6*(x-15)-x-20 = 0
1/6*(x-15)-x-20 = 0
-5/6*x-20-5/2 = 0
-5/6*x-45/2 = 0
-5/6*x-45/2 = 0
-5/6*x-45/2 = 0 // + 45/2
-5/6*x = 45/2 // : -5/6
x = 45/2/(-5/6)
x = -27
x = -27
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