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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/n = 3/5 // - 3/5
16/n-(3/5) = 0
16/n-3/5 = 0
16*n^-1 = 3/5 // : 16
n^-1 = 3/80
-1 < 0
1/(n^1) = 3/80 // * n^1
1 = 3/80*n^1 // : 3/80
80/3 = n^1
n = 80/3
n = 80/3
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