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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
56/n = 8/11 // - 8/11
56/n-(8/11) = 0
56/n-8/11 = 0
56*n^-1 = 8/11 // : 56
n^-1 = 1/77
-1 < 0
1/(n^1) = 1/77 // * n^1
1 = 1/77*n^1 // : 1/77
77 = n^1
n = 77
n = 77
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