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x in (-oo:+oo)
(-1/9)*x-4 > -9 // + 9
(-1/9)*x-4+9 > 0
5-1/9*x > 0 // - 5
-1/9*x > -5 // : -1/9
x < -5/(-1/9)
x < 45
x in (-oo:45)
(-oo:45)
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