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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(8*n)/n = 8/3 // - 8/3
(8*n)/n-(8/3) = 0
(8*n)/n-8/3 = 0
16/3 = 0
n belongs to the empty set
n belongs to the empty set
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