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y in (-oo:+oo)
7-((2*y)/3) < -5 // + 5
5-((2*y)/3)+7 < 0
(-2/3)*y+5+7 < 0
12-2/3*y < 0 // - 12
-2/3*y < -12 // : -2/3
y > -12/(-2/3)
y > 18
y in (18:+oo)
(18:+oo)
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