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x in (-oo:+oo)
9-(x/7) < 1 // - 1
9-(x/7)-1 < 0
8-1/7*x < 0 // - 8
-1/7*x < -8 // : -1/7
x > -8/(-1/7)
x > 56
x in (56:+oo)
(56:+oo)
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