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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(2/9)/n+2/3 = 6 // - 6
(2/9)/n+2/3-6 = 0
2/9*n^-1 = 16/3 // : 2/9
n^-1 = 24
-1 < 0
1/(n^1) = 24 // * n^1
1 = 24*n^1 // : 24
1/24 = n^1
n = 1/24
n = 1/24
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