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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
64/n = 2 // - 2
64/n-2 = 0
64*n^-1 = 2 // : 64
n^-1 = 1/32
-1 < 0
1/(n^1) = 1/32 // * n^1
1 = 1/32*n^1 // : 1/32
32 = n^1
n = 32
n = 32
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