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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/6 = 11/n // - 11/n
5/6-(11/n) = 0
5/6-11*n^-1 = 0
-11*n^-1 = -5/6 // : -11
n^-1 = 5/66
-1 < 0
1/(n^1) = 5/66 // * n^1
1 = 5/66*n^1 // : 5/66
66/5 = n^1
n = 66/5
n = 66/5
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