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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
45/n = 9/11 // - 9/11
45/n-(9/11) = 0
45/n-9/11 = 0
45*n^-1 = 9/11 // : 45
n^-1 = 1/55
-1 < 0
1/(n^1) = 1/55 // * n^1
1 = 1/55*n^1 // : 1/55
55 = n^1
n = 55
n = 55
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