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x in (-oo:+oo)
(-1/9)*(x-27)+(1/3)*(x+3) = x+11 // - x+11
(-1/9)*(x-27)+(1/3)*(x+3)-x-11 = 0
1/3*(x+3)-1/9*(x-27)-x-11 = 0
1/3*(x+3)-1/9*(x-27)-x-11 = 0
2/9*x-x-11+4 = 0
4-7/9*x-11 = 0
-7/9*x-7 = 0
-7/9*x-7 = 0
-7/9*x-7 = 0 // + 7
-7/9*x = 7 // : -7/9
x = 7/(-7/9)
x = -9
x = -9
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