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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
13/n = 39/27 // - 39/27
13/n-(39/27) = 0
13/n-13/9 = 0
13*n^-1 = 13/9 // : 13
n^-1 = 1/9
-1 < 0
1/(n^1) = 1/9 // * n^1
1 = 1/9*n^1 // : 1/9
9 = n^1
n = 9
n = 9
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