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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/6 = 16/n // - 16/n
1/6-(16/n) = 0
1/6-16*n^-1 = 0
-16*n^-1 = -1/6 // : -16
n^-1 = 1/96
-1 < 0
1/(n^1) = 1/96 // * n^1
1 = 1/96*n^1 // : 1/96
96 = n^1
n = 96
n = 96
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