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D( n )
n^-12 = 0
n = 0
n^-12 = 0
n^-12 = 0
1*n^-12 = 0 // : 1
n^-12 = 0
n naleu017Cy do O
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(2*n)/(n^-12) = 0
2*n^13 = 0 // : 2
n^13 = 0
n = 0
n in { 0}
n belongs to the empty set
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