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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 20/24 // - 20/24
5/n-(20/24) = 0
5/n-5/6 = 0
5*n^-1 = 5/6 // : 5
n^-1 = 1/6
-1 < 0
1/(n^1) = 1/6 // * n^1
1 = 1/6*n^1 // : 1/6
6 = n^1
n = 6
n = 6
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