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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
24/n = 61/10 // - 61/10
24/n-(61/10) = 0
24/n-61/10 = 0
24*n^-1 = 61/10 // : 24
n^-1 = 61/240
-1 < 0
1/(n^1) = 61/240 // * n^1
1 = 61/240*n^1 // : 61/240
240/61 = n^1
n = 240/61
n = 240/61
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