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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
n/n-3+4 = n/n-3 // - n/n-3
n/n-(n/n)-3+3+4 = 0
n/n-3-1+3+4 = 0
4 = 0
n belongs to the empty set
n belongs to the empty set
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