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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/3 = 16.2/n // - 16.2/n
5/3-(16.2/n) = 0
5/3-16.2*n^-1 = 0
-16.2*n^-1 = -5/3 // : -16.2
n^-1 = 0.10288066
-1 < 0
1/(n^1) = 0.10288066 // * n^1
1 = 0.10288066*n^1 // : 0.10288066
9.71999985 = n^1
n = 9.71999985
n = 9.71999985
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