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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/6 = 25/n // - 25/n
4/6-(25/n) = 0
4/6-25*n^-1 = 0
-25*n^-1 = -2/3 // : -25
n^-1 = 2/75
-1 < 0
1/(n^1) = 2/75 // * n^1
1 = 2/75*n^1 // : 2/75
75/2 = n^1
n = 75/2
n = 75/2
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