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x in (-oo:+oo)
(1/9)*(x+9) = (1/18)*(2*x+18) // - (1/18)*(2*x+18)
(1/9)*(x+9)-((1/18)*(2*x+18)) = 0
(1/9)*(x+9)+(-1/18)*(2*x+18) = 0
1/9*(x+9)-1/18*(2*x+18) = 0
1/9*(x+9)-1/18*(2*x+18) = 0
0 = 0
0 = 0
x belongs to the empty set
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