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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6 = 27/n-3 // - 27/n-3
3-(27/n)+6 = 0
3-27*n^-1+6 = 0
-27*n^-1 = -9 // : -27
n^-1 = 1/3
-1 < 0
1/(n^1) = 1/3 // * n^1
1 = 1/3*n^1 // : 1/3
3 = n^1
n = 3
n = 3
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