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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
11/n = 8/5 // - 8/5
11/n-(8/5) = 0
11/n-8/5 = 0
11*n^-1 = 8/5 // : 11
n^-1 = 8/55
-1 < 0
1/(n^1) = 8/55 // * n^1
1 = 8/55*n^1 // : 8/55
55/8 = n^1
n = 55/8
n = 55/8
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