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x in (-oo:+oo)
(-1/9)*(x-27)+(1/3)*(x+11) = x+11 // - x+11
(-1/9)*(x-27)+(1/3)*(x+11)-x-11 = 0
1/3*(x+11)-1/9*(x-27)-x-11 = 0
1/3*(x+11)-1/9*(x-27)-x-11 = 0
2/9*x-x-11+20/3 = 0
20/3-7/9*x-11 = 0
-7/9*x-13/3 = 0
-7/9*x-13/3 = 0
-7/9*x-13/3 = 0 // + 13/3
-7/9*x = 13/3 // : -7/9
x = 13/3/(-7/9)
x = -39/7
x = -39/7
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