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