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y in (-oo:+oo)
(8/9)*y < -5 // + 5
(8/9)*y+5 < 0
8/9*y+5 < 0 // - 5
8/9*y < -5 // : 8/9
y < -5/8/9
y < -45/8
y in (-oo:-45/8)
(-oo:-45/8)
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