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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
18/n = 3/11 // - 3/11
18/n-(3/11) = 0
18/n-3/11 = 0
18*n^-1 = 3/11 // : 18
n^-1 = 1/66
-1 < 0
1/(n^1) = 1/66 // * n^1
1 = 1/66*n^1 // : 1/66
66 = n^1
n = 66
n = 66
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