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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/6 = 54/n // - 54/n
12/6-(54/n) = 0
12/6-54*n^-1 = 0
-54*n^-1 = -2 // : -54
n^-1 = 1/27
-1 < 0
1/(n^1) = 1/27 // * n^1
1 = 1/27*n^1 // : 1/27
27 = n^1
n = 27
n = 27
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