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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
23/n = 1 // - 1
23/n-1 = 0
23*n^-1 = 1 // : 23
n^-1 = 1/23
-1 < 0
1/(n^1) = 1/23 // * n^1
1 = 1/23*n^1 // : 1/23
23 = n^1
n = 23
n = 23
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