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x in (-oo:+oo)
x/9 > 9 // - 9
x/9-9 > 0
1/9*x-9 > 0 // + 9
1/9*x > 9 // : 1/9
x > 9/1/9
x > 81
x in (81:+oo)
(81:+oo)
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