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x in (-oo:+oo)
5-((5/4)*x) > 9 // - 9
5-((5/4)*x)-9 > 0
(-5/4)*x-9+5 > 0
-5/4*x-4 > 0 // + 4
-5/4*x > 4 // : -5/4
x < 4/(-5/4)
x < -16/5
x in (-oo:-16/5)
(-oo:-16/5)
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