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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/8 = n/n+1 // - n/n+1
5/8-(n/n)-1 = 0
5/8-1-1 = 0
-11/8 = 0
n belongs to the empty set
n belongs to the empty set
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