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