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k in (-oo:+oo)
3 > k/2 // - k/2
3-(k/2) > 0
3-1/2*k > 0 // - 3
-1/2*k > -3 // : -1/2
k < -3/(-1/2)
k < 6
k in (-oo:6)
(-oo:6)
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