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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/2 = 25/n // - 25/n
6/2-(25/n) = 0
6/2-25*n^-1 = 0
-25*n^-1 = -3 // : -25
n^-1 = 3/25
-1 < 0
1/(n^1) = 3/25 // * n^1
1 = 3/25*n^1 // : 3/25
25/3 = n^1
n = 25/3
n = 25/3
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