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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 32/20 // - 32/20
8/n-(32/20) = 0
8/n-8/5 = 0
8*n^-1 = 8/5 // : 8
n^-1 = 1/5
-1 < 0
1/(n^1) = 1/5 // * n^1
1 = 1/5*n^1 // : 1/5
5 = n^1
n = 5
n = 5
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