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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 9/11 // - 9/11
6/n-(9/11) = 0
6/n-9/11 = 0
6*n^-1 = 9/11 // : 6
n^-1 = 3/22
-1 < 0
1/(n^1) = 3/22 // * n^1
1 = 3/22*n^1 // : 3/22
22/3 = n^1
n = 22/3
n = 22/3
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