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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 15/60 // - 15/60
8/n-(15/60) = 0
8/n-1/4 = 0
8*n^-1 = 1/4 // : 8
n^-1 = 1/32
-1 < 0
1/(n^1) = 1/32 // * n^1
1 = 1/32*n^1 // : 1/32
32 = n^1
n = 32
n = 32
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