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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
27/n = 12 // - 12
27/n-12 = 0
27*n^-1 = 12 // : 27
n^-1 = 4/9
-1 < 0
1/(n^1) = 4/9 // * n^1
1 = 4/9*n^1 // : 4/9
9/4 = n^1
n = 9/4
n = 9/4
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