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