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X in (-oo:+oo)
X/(-15) < -4 // + 4
X/(-15)+4 < 0
4-1/15*X < 0 // - 4
-1/15*X < -4 // : -1/15
X > -4/(-1/15)
X > 60
X in (60:+oo)
(60:+oo)
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