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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
221/n = 13/12 // - 13/12
221/n-(13/12) = 0
221/n-13/12 = 0
221*n^-1 = 13/12 // : 221
n^-1 = 1/204
-1 < 0
1/(n^1) = 1/204 // * n^1
1 = 1/204*n^1 // : 1/204
204 = n^1
n = 204
n = 204
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