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Y in (-oo:+oo)
Y/(-4) < -3 // + 3
Y/(-4)+3 < 0
3-1/4*Y < 0 // - 3
-1/4*Y < -3 // : -1/4
Y > -3/(-1/4)
Y > 12
Y in (12:+oo)
(12:+oo)
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