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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/16 = 4/n // - 4/n
8/16-(4/n) = 0
8/16-4*n^-1 = 0
-4*n^-1 = -1/2 // : -4
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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