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x in (-oo:+oo)
(1/6)*(x-12)+(1/2)*(x+2) = x+3 // - x+3
(1/6)*(x-12)+(1/2)*(x+2)-x-3 = 0
1/6*(x-12)+1/2*(x+2)-x-3 = 0
1/6*(x-12)+1/2*(x+2)-x-3 = 0
2/3*x-x-3-1 = 0
-1/3*x-3-1 = 0
-1/3*x-4 = 0
-1/3*x-4 = 0
-1/3*x-4 = 0 // + 4
-1/3*x = 4 // : -1/3
x = 4/(-1/3)
x = -12
x = -12
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