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x in (-oo:+oo)
(1/3)*(x-6)-((1/9)*(x-9)) = x-8 // - x-8
(1/3)*(x-6)-((1/9)*(x-9))-x+8 = 0
(1/3)*(x-6)+(-1/9)*(x-9)-x+8 = 0
1/3*(x-6)-1/9*(x-9)-x+8 = 0
1/3*(x-6)-1/9*(x-9)-x+8 = 0
2/9*x-x-1+8 = 0
8-7/9*x-1 = 0
7-7/9*x = 0
7-7/9*x = 0
7-7/9*x = 0 // - 7
-7/9*x = -7 // : -7/9
x = -7/(-7/9)
x = 9
x = 9
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