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