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