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x in (-oo:+oo)
4-((8/7)*x) > 9 // - 9
4-((8/7)*x)-9 > 0
(-8/7)*x-9+4 > 0
-8/7*x-5 > 0 // + 5
-8/7*x > 5 // : -8/7
x < 5/(-8/7)
x < -35/8
x in (-oo:-35/8)
(-oo:-35/8)
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