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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
30/n = 13/11 // - 13/11
30/n-(13/11) = 0
30/n-13/11 = 0
30*n^-1 = 13/11 // : 30
n^-1 = 13/330
-1 < 0
1/(n^1) = 13/330 // * n^1
1 = 13/330*n^1 // : 13/330
330/13 = n^1
n = 330/13
n = 330/13
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