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