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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
33/n = 3 // - 3
33/n-3 = 0
33*n^-1 = 3 // : 33
n^-1 = 1/11
-1 < 0
1/(n^1) = 1/11 // * n^1
1 = 1/11*n^1 // : 1/11
11 = n^1
n = 11
n = 11
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