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