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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
36/n = 9/11 // - 9/11
36/n-(9/11) = 0
36/n-9/11 = 0
36*n^-1 = 9/11 // : 36
n^-1 = 1/44
-1 < 0
1/(n^1) = 1/44 // * n^1
1 = 1/44*n^1 // : 1/44
44 = n^1
n = 44
n = 44
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