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x in (-oo:+oo)
(9*x)/1-(6*x) = 15 // - 15
(9*x)/1-(6*x)-15 = 0
9*x-6*x-15 = 0
3*x-15 = 0 // + 15
3*x = 15 // : 3
x = 15/3
x = 5
x = 5
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