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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5 = 32/n // - 32/n
5-(32/n) = 0
5-32*n^-1 = 0
-32*n^-1 = -5 // : -32
n^-1 = 5/32
-1 < 0
1/(n^1) = 5/32 // * n^1
1 = 5/32*n^1 // : 5/32
32/5 = n^1
n = 32/5
n = 32/5
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