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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/5 = 9/n // - 9/n
2/5-(9/n) = 0
2/5-9*n^-1 = 0
-9*n^-1 = -2/5 // : -9
n^-1 = 2/45
-1 < 0
1/(n^1) = 2/45 // * n^1
1 = 2/45*n^1 // : 2/45
45/2 = n^1
n = 45/2
n = 45/2
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