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D( n )
(-n)^5 = 0
(-n)^5 = 0
(-n)^5 = 0
-1*n^5 = 0 // : -1
n^5 = 0
n = 0
n in (-oo:0) U (0:+oo)
(6*n^7)/((-n)^5) = 0
-6*n^2 = 0 // : -6
n^2 = 0
n = 0
n in { 0}
n belongs to the empty set
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