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k in (-oo:+oo)
5*k-(6/(-7)) < 6 // - 6
5*k-(6/(-7))-6 < 0
5*k+6/7-6 < 0
5*k-36/7 < 0 // + 36/7
5*k < 36/7 // : 5
k < 36/7/5
k < 36/35
k in (-oo:36/35)
(-oo:36/35)
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