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