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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 8/9 // - 8/9
6/n-(8/9) = 0
6/n-8/9 = 0
6*n^-1 = 8/9 // : 6
n^-1 = 4/27
-1 < 0
1/(n^1) = 4/27 // * n^1
1 = 4/27*n^1 // : 4/27
27/4 = n^1
n = 27/4
n = 27/4
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