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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 24 // - 24
3/n-24 = 0
3*n^-1 = 24 // : 3
n^-1 = 8
-1 < 0
1/(n^1) = 8 // * n^1
1 = 8*n^1 // : 8
1/8 = n^1
n = 1/8
n = 1/8
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