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x in (-oo:+oo)
(0.9*x)/1-(0.9*x) = 0.1 // - 0.1
(0.9*x)/1-(0.9*x)-0.1 = 0
0.9*x-0.9*x-0.1 = 0
-0.1 = 0
x belongs to the empty set
x belongs to the empty set
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