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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 6/3 // - 6/3
5/n-(6/3) = 0
5/n-2 = 0
5*n^-1 = 2 // : 5
n^-1 = 2/5
-1 < 0
1/(n^1) = 2/5 // * n^1
1 = 2/5*n^1 // : 2/5
5/2 = n^1
n = 5/2
n = 5/2
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