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x in (-oo:+oo)
(5/7)*x > 9 // - 9
(5/7)*x-9 > 0
5/7*x-9 > 0 // + 9
5/7*x > 9 // : 5/7
x > 9/5/7
x > 63/5
x in (63/5:+oo)
(63/5:+oo)
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