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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/n-3 = 2/3 // - 2/3
1/n-(2/3)-3 = 0
1/n-2/3-3 = 0
1*n^-1 = 11/3 // : 1
n^-1 = 11/3
-1 < 0
1/(n^1) = 11/3 // * n^1
1 = 11/3*n^1 // : 11/3
3/11 = n^1
n = 3/11
n = 3/11
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