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k in (-oo:+oo)
-2 < 5-(k/2) // - 5-(k/2)
k/2-5-2 < 0
1/2*k-7 < 0 // + 7
1/2*k < 7 // : 1/2
k < 7/1/2
k < 14
k in (-oo:14)
(-oo:14)
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