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k in (-oo:+oo)
1/2-(2*k) < -1/4 // + -1/4
1/2-(2*k)-(-1/4) < 0
1/2-2*k+1/4 < 0
3/4-2*k < 0 // - 3/4
-2*k < -3/4 // : -2
k > -3/4/(-2)
k > 3/8
k in (3/8:+oo)
(3/8:+oo)
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