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n in (-oo:+oo)
5 < n/8 // - n/8
5-(n/8) < 0
5-1/8*n < 0 // - 5
-1/8*n < -5 // : -1/8
n > -5/(-1/8)
n > 40
n in (40:+oo)
(40:+oo)
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