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k in (-oo:+oo)
3*k-(1/4) > 5 // - 5
3*k-(1/4)-5 > 0
3*k-1/4-5 > 0
3*k-21/4 > 0 // + 21/4
3*k > 21/4 // : 3
k > 21/4/3
k > 7/4
k in (7/4:+oo)
(7/4:+oo)
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