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D( n )
n^9 = 0
n^9 = 0
n^9 = 0
1*n^9 = 0 // : 1
n^9 = 0
n = 0
n in (-oo:0) U (0:+oo)
(n^18)/(n^9) = 0
1*n^9 = 0 // : 1
n^9 = 0
n = 0
n in { 0}
n belongs to the empty set
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