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y in (-oo:+oo)
1-((5/9)*y) > 7/6-((4/9)*y) // - 7/6-((4/9)*y)
(4/9)*y-((5/9)*y)-(7/6)+1 > 0
(-5/9)*y+(4/9)*y-7/6+1 > 0
-1/9*y-1/6 > 0 // + 1/6
-1/9*y > 1/6 // : -1/9
y < 1/6/(-1/9)
y < -3/2
y in (-oo:-3/2)
(-oo:-3/2)
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