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x in (-oo:+oo)
6/90 = 9*x // - 9*x
6/90-(9*x) = 0
6/90-9*x = 0
1/15-9*x = 0 // - 1/15
-9*x = -1/15 // : -9
x = -1/15/(-9)
x = 1/135
x = 1/135
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