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d in (-oo:+oo)
d/4 < 8 // - 8
d/4-8 < 0
1/4*d-8 < 0 // + 8
1/4*d < 8 // : 1/4
d < 8/1/4
d < 32
d in (-oo:32)
(-oo:32)
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