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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 12/25 // - 12/25
3/n-(12/25) = 0
3/n-12/25 = 0
3*n^-1 = 12/25 // : 3
n^-1 = 4/25
-1 < 0
1/(n^1) = 4/25 // * n^1
1 = 4/25*n^1 // : 4/25
25/4 = n^1
n = 25/4
n = 25/4
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