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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15/n = 5/8 // - 5/8
15/n-(5/8) = 0
15/n-5/8 = 0
15*n^-1 = 5/8 // : 15
n^-1 = 1/24
-1 < 0
1/(n^1) = 1/24 // * n^1
1 = 1/24*n^1 // : 1/24
24 = n^1
n = 24
n = 24
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