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X in (-oo:+oo)
X/(-3) < 5 // - 5
X/(-3)-5 < 0
-1/3*X-5 < 0 // + 5
-1/3*X < 5 // : -1/3
X > 5/(-1/3)
X > -15
X in (-15:+oo)
(-15:+oo)
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