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k in (-oo:+oo)
2*k-(5/(-4)) < 5 // - 5
2*k-(5/(-4))-5 < 0
2*k+5/4-5 < 0
2*k-15/4 < 0 // + 15/4
2*k < 15/4 // : 2
k < 15/4/2
k < 15/8
k in (-oo:15/8)
(-oo:15/8)
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