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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
24/n = 12 // - 12
24/n-12 = 0
24*n^-1 = 12 // : 24
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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