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x in (-oo:+oo)
5-((7/4)*x) > 9 // - 9
5-((7/4)*x)-9 > 0
(-7/4)*x-9+5 > 0
-7/4*x-4 > 0 // + 4
-7/4*x > 4 // : -7/4
x < 4/(-7/4)
x < -16/7
x in (-oo:-16/7)
(-oo:-16/7)
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