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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/n = 4/34 // - 4/34
1/n-(4/34) = 0
1/n-2/17 = 0
1*n^-1 = 2/17 // : 1
n^-1 = 2/17
-1 < 0
1/(n^1) = 2/17 // * n^1
1 = 2/17*n^1 // : 2/17
17/2 = n^1
n = 17/2
n = 17/2
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