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