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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(2/5)/n = 5 // - 5
(2/5)/n-5 = 0
2/5*n^-1 = 5 // : 2/5
n^-1 = 25/2
-1 < 0
1/(n^1) = 25/2 // * n^1
1 = 25/2*n^1 // : 25/2
2/25 = n^1
n = 2/25
n = 2/25
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