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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 2/38 // - 2/38
5/n-(2/38) = 0
5/n-1/19 = 0
5*n^-1 = 1/19 // : 5
n^-1 = 1/95
-1 < 0
1/(n^1) = 1/95 // * n^1
1 = 1/95*n^1 // : 1/95
95 = n^1
n = 95
n = 95
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