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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/n = 100 // - 100
16/n-100 = 0
16*n^-1 = 100 // : 16
n^-1 = 25/4
-1 < 0
1/(n^1) = 25/4 // * n^1
1 = 25/4*n^1 // : 25/4
4/25 = n^1
n = 4/25
n = 4/25
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