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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 9/3 // - 9/3
5/n-(9/3) = 0
5/n-3 = 0
5*n^-1 = 3 // : 5
n^-1 = 3/5
-1 < 0
1/(n^1) = 3/5 // * n^1
1 = 3/5*n^1 // : 3/5
5/3 = n^1
n = 5/3
n = 5/3
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