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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/8 = n/n-5 // - n/n-5
2/8-(n/n)+5 = 0
2/8-1+5 = 0
17/4 = 0
n belongs to the empty set
n belongs to the empty set
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