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k in (-oo:+oo)
-8 > k/(-0.4) // - k/(-0.4)
-(k/(-0.4))-8 > 0
2.5*k-8 > 0
2.5*k-8 > 0 // + 8
2.5*k > 8 // : 2.5
k > 8/2.5
k > 3.2
k in (3.2:+oo)
(3.2:+oo)
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