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x in (-oo:+oo)
4/5 > (9/2)*x // - (9/2)*x
4/5-((9/2)*x) > 0
(-9/2)*x+4/5 > 0
4/5-9/2*x > 0 // - 4/5
-9/2*x > -4/5 // : -9/2
x < -4/5/(-9/2)
x < 8/45
x in (-oo:8/45)
(-oo:8/45)
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