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d in (-oo:+oo)
d/(-7) < -8 // + 8
d/(-7)+8 < 0
8-1/7*d < 0 // - 8
-1/7*d < -8 // : -1/7
d > -8/(-1/7)
d > 56
d in (56:+oo)
(56:+oo)
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