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Y in (-oo:+oo)
Y/5 > 4 // - 4
Y/5-4 > 0
1/5*Y-4 > 0 // + 4
1/5*Y > 4 // : 1/5
Y > 4/1/5
Y > 20
Y in (20:+oo)
(20:+oo)
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