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