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D in (-oo:+oo)
D/(-3) > -3 // + 3
D/(-3)+3 > 0
3-1/3*D > 0 // - 3
-1/3*D > -3 // : -1/3
D < -3/(-1/3)
D < 9
D in (-oo:9)
(-oo:9)
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