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x in (-oo:+oo)
(-1/6)*(x-12)+(1/2)*(x+2) = x+11 // - x+11
(-1/6)*(x-12)+(1/2)*(x+2)-x-11 = 0
1/2*(x+2)-1/6*(x-12)-x-11 = 0
1/2*(x+2)-1/6*(x-12)-x-11 = 0
1/3*x-x-11+3 = 0
3-2/3*x-11 = 0
-2/3*x-8 = 0
-2/3*x-8 = 0
-2/3*x-8 = 0 // + 8
-2/3*x = 8 // : -2/3
x = 8/(-2/3)
x = -12
x = -12
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