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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/9 = 10/n // - 10/n
4/9-(10/n) = 0
4/9-10*n^-1 = 0
-10*n^-1 = -4/9 // : -10
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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