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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
n/n+12 = 9/12 // - 9/12
n/n-(9/12)+12 = 0
n/n-3/4+12 = 0
49/4 = 0
n belongs to the empty set
n belongs to the empty set
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