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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 8/3 // - 8/3
4/n-(8/3) = 0
4/n-8/3 = 0
4*n^-1 = 8/3 // : 4
n^-1 = 2/3
-1 < 0
1/(n^1) = 2/3 // * n^1
1 = 2/3*n^1 // : 2/3
3/2 = n^1
n = 3/2
n = 3/2
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