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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 80/100 // - 80/100
4/n-(80/100) = 0
4/n-4/5 = 0
4*n^-1 = 4/5 // : 4
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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