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x in (-oo:+oo)
(1/9)*(x-27)+(1/3)*(x+3) = x-3 // - x-3
(1/9)*(x-27)+(1/3)*(x+3)-x+3 = 0
1/9*(x-27)+1/3*(x+3)-x+3 = 0
1/9*(x-27)+1/3*(x+3)-x+3 = 0
4/9*x-x-2+3 = 0
3-5/9*x-2 = 0
1-5/9*x = 0
1-5/9*x = 0
1-5/9*x = 0 // - 1
-5/9*x = -1 // : -5/9
x = -1/(-5/9)
x = 9/5
x = 9/5
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