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k in (-oo:+oo)
-8 > k/(-2) // - k/(-2)
-(k/(-2))-8 > 0
1/2*k-8 > 0 // + 8
1/2*k > 8 // : 1/2
k > 8/1/2
k > 16
k in (16:+oo)
(16:+oo)
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