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D in (-oo:+oo)
D/2-1 > 3 // - 3
D/2-3-1 > 0
1/2*D-4 > 0 // + 4
1/2*D > 4 // : 1/2
D > 4/1/2
D > 8
D in (8:+oo)
(8:+oo)
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