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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/3 = 9/n // - 9/n
8/3-(9/n) = 0
8/3-9*n^-1 = 0
-9*n^-1 = -8/3 // : -9
n^-1 = 8/27
-1 < 0
1/(n^1) = 8/27 // * n^1
1 = 8/27*n^1 // : 8/27
27/8 = n^1
n = 27/8
n = 27/8
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