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x in (-oo:+oo)
x/(-9) > -4 // + 4
x/(-9)+4 > 0
4-1/9*x > 0 // - 4
-1/9*x > -4 // : -1/9
x < -4/(-1/9)
x < 36
x in (-oo:36)
(-oo:36)
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