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h in (-oo:+oo)
8 > h/10 // - h/10
8-(h/10) > 0
8-1/10*h > 0 // - 8
-1/10*h > -8 // : -1/10
h < -8/(-1/10)
h < 80
h in (-oo:80)
(-oo:80)
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