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x in (-oo:+oo)
1-((7/8)*x) > 9 // - 9
1-((7/8)*x)-9 > 0
(-7/8)*x-9+1 > 0
-7/8*x-8 > 0 // + 8
-7/8*x > 8 // : -7/8
x < 8/(-7/8)
x < -64/7
x in (-oo:-64/7)
(-oo:-64/7)
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