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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
71/n-1 = 0
71*n^-1 = 1 // : 71
n^-1 = 1/71
-1 < 0
1/(n^1) = 1/71 // * n^1
1 = 1/71*n^1 // : 1/71
71 = n^1
n = 71
n = 71
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