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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
32/n = 16 // - 16
32/n-16 = 0
32*n^-1 = 16 // : 32
n^-1 = 1/2
-1 < 0
1/(n^1) = 1/2 // * n^1
1 = 1/2*n^1 // : 1/2
2 = n^1
n = 2
n = 2
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