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d in (-oo:+oo)
d/4 > 4 // - 4
d/4-4 > 0
1/4*d-4 > 0 // + 4
1/4*d > 4 // : 1/4
d > 4/1/4
d > 16
d in (16:+oo)
(16:+oo)
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