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x in (-oo:+oo)
(1/3)*(x-9) = x+9 // - x+9
(1/3)*(x-9)-x-9 = 0
1/3*(x-9)-x-9 = 0
1/3*(x-9)-x-9 = 0
-2/3*x-9-3 = 0
-2/3*x-12 = 0
-2/3*x-12 = 0
-2/3*x-12 = 0 // + 12
-2/3*x = 12 // : -2/3
x = 12/(-2/3)
x = -18
x = -18
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