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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10/n = 9/13 // - 9/13
10/n-(9/13) = 0
10/n-9/13 = 0
10*n^-1 = 9/13 // : 10
n^-1 = 9/130
-1 < 0
1/(n^1) = 9/130 // * n^1
1 = 9/130*n^1 // : 9/130
130/9 = n^1
n = 130/9
n = 130/9
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