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k in (-oo:+oo)
(-7/2)*k > 14 // - 14
(-7/2)*k-14 > 0
-7/2*k-14 > 0 // + 14
-7/2*k > 14 // : -7/2
k < 14/(-7/2)
k < -4
k in (-oo:-4)
(-oo:-4)
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