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x in (-oo:+oo)
(-5*x)/9-4 > -5 // + 5
(-5*x)/9-4+5 > 0
1-5/9*x > 0 // - 1
-5/9*x > -1 // : -5/9
x < -1/(-5/9)
x < 9/5
x in (-oo:9/5)
(-oo:9/5)
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