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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/11 = 6/n // - 6/n
8/11-(6/n) = 0
8/11-6*n^-1 = 0
-6*n^-1 = -8/11 // : -6
n^-1 = 4/33
-1 < 0
1/(n^1) = 4/33 // * n^1
1 = 4/33*n^1 // : 4/33
33/4 = n^1
n = 33/4
n = 33/4
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