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k in (-oo:+oo)
(1/2)*k-1 < 4 // - 4
(1/2)*k-4-1 < 0
1/2*k-5 < 0 // + 5
1/2*k < 5 // : 1/2
k < 5/1/2
k < 10
k in (-oo:10)
(-oo:10)
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