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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(2/3)/n = 4/9 // - 4/9
(2/3)/n-(4/9) = 0
(2/3)/n-4/9 = 0
2/3*n^-1 = 4/9 // : 2/3
n^-1 = 2/3
-1 < 0
1/(n^1) = 2/3 // * n^1
1 = 2/3*n^1 // : 2/3
3/2 = n^1
n = 3/2
n = 3/2
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