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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/n = 2 // - 2
16/n-2 = 0
16*n^-1 = 2 // : 16
n^-1 = 1/8
-1 < 0
1/(n^1) = 1/8 // * n^1
1 = 1/8*n^1 // : 1/8
8 = n^1
n = 8
n = 8
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