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y in (-oo:+oo)
-4*y < 1/4 // - 1/4
-4*y-(1/4) < 0
-4*y-1/4 < 0
-4*y-1/4 < 0 // + 1/4
-4*y < 1/4 // : -4
y > 1/4/(-4)
y > -1/16
y in (-1/16:+oo)
(-1/16:+oo)
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