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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
24/n = 5/9 // - 5/9
24/n-(5/9) = 0
24/n-5/9 = 0
24*n^-1 = 5/9 // : 24
n^-1 = 5/216
-1 < 0
1/(n^1) = 5/216 // * n^1
1 = 5/216*n^1 // : 5/216
216/5 = n^1
n = 216/5
n = 216/5
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