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D in (-oo:+oo)
D/4-15 > -2 // + 2
D/4-15+2 > 0
1/4*D-13 > 0 // + 13
1/4*D > 13 // : 1/4
D > 13/1/4
D > 52
D in (52:+oo)
(52:+oo)
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