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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/6 = 5/n-1 // - 5/n-1
3/6-(5/n)+1 = 0
3/6-5*n^-1+1 = 0
-5*n^-1 = -3/2 // : -5
n^-1 = 3/10
-1 < 0
1/(n^1) = 3/10 // * n^1
1 = 3/10*n^1 // : 3/10
10/3 = n^1
n = 10/3
n = 10/3
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