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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
25/7 = 4/n // - 4/n
25/7-(4/n) = 0
25/7-4*n^-1 = 0
-4*n^-1 = -25/7 // : -4
n^-1 = 25/28
-1 < 0
1/(n^1) = 25/28 // * n^1
1 = 25/28*n^1 // : 25/28
28/25 = n^1
n = 28/25
n = 28/25
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