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k in (-oo:+oo)
5*k-(4/(-5)) > 4 // - 4
5*k-(4/(-5))-4 > 0
5*k+4/5-4 > 0
5*k-16/5 > 0 // + 16/5
5*k > 16/5 // : 5
k > 16/5/5
k > 16/25
k in (16/25:+oo)
(16/25:+oo)
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