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k in (-oo:+oo)
10*k-(3/(-7)) > 3 // - 3
10*k-(3/(-7))-3 > 0
10*k+3/7-3 > 0
10*k-18/7 > 0 // + 18/7
10*k > 18/7 // : 10
k > 18/7/10
k > 9/35
k in (9/35:+oo)
(9/35:+oo)
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