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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
24/18 = 108/n // - 108/n
24/18-(108/n) = 0
24/18-108*n^-1 = 0
-108*n^-1 = -4/3 // : -108
n^-1 = 1/81
-1 < 0
1/(n^1) = 1/81 // * n^1
1 = 1/81*n^1 // : 1/81
81 = n^1
n = 81
n = 81
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