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D in (-oo:+oo)
D/13-12 > 27 // - 27
D/13-27-12 > 0
1/13*D-39 > 0 // + 39
1/13*D > 39 // : 1/13
D > 39/1/13
D > 507
D in (507:+oo)
(507:+oo)
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