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X in (-oo:+oo)
X/7 > 9 // - 9
X/7-9 > 0
1/7*X-9 > 0 // + 9
1/7*X > 9 // : 1/7
X > 9/1/7
X > 63
X in (63:+oo)
(63:+oo)
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