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x in (-oo:+oo)
8-((5/7)*x) > 9 // - 9
8-((5/7)*x)-9 > 0
(-5/7)*x-9+8 > 0
-5/7*x-1 > 0 // + 1
-5/7*x > 1 // : -5/7
x < 1/(-5/7)
x < -7/5
x in (-oo:-7/5)
(-oo:-7/5)
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