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x in (-oo:+oo)
(1/9)*(x-27)+(1/3)*(x+3) = x+4 // - x+4
(1/9)*(x-27)+(1/3)*(x+3)-x-4 = 0
1/9*(x-27)+1/3*(x+3)-x-4 = 0
1/9*(x-27)+1/3*(x+3)-x-4 = 0
4/9*x-x-4-2 = 0
-5/9*x-4-2 = 0
-5/9*x-6 = 0
-5/9*x-6 = 0
-5/9*x-6 = 0 // + 6
-5/9*x = 6 // : -5/9
x = 6/(-5/9)
x = -54/5
x = -54/5
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