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