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x in (-oo:+oo)
5-((5/4)*x) > -4 // + 4
4-((5/4)*x)+5 > 0
(-5/4)*x+4+5 > 0
9-5/4*x > 0 // - 9
-5/4*x > -9 // : -5/4
x < -9/(-5/4)
x < 36/5
x in (-oo:36/5)
(-oo:36/5)
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