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k in (-oo:+oo)
5*k-(3/(-3)) > 3 // - 3
5*k-(3/(-3))-3 > 0
5*k-3+1 > 0
5*k-2 > 0 // + 2
5*k > 2 // : 5
k > 2/5
k in (2/5:+oo)
(2/5:+oo)
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