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y in (-oo:+oo)
1 < (-5/4)*y // - (-5/4)*y
1-((-5/4)*y) < 0
(5/4)*y+1 < 0
5/4*y+1 < 0 // - 1
5/4*y < -1 // : 5/4
y < -1/5/4
y < -4/5
y in (-oo:-4/5)
(-oo:-4/5)
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