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