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y in (-oo:+oo)
2/3 < (4/5)*y // - (4/5)*y
2/3-((4/5)*y) < 0
(-4/5)*y+2/3 < 0
2/3-4/5*y < 0 // - 2/3
-4/5*y < -2/3 // : -4/5
y > -2/3/(-4/5)
y > 5/6
y in (5/6:+oo)
(5/6:+oo)
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