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