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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 4/3 // - 4/3
5/n-(4/3) = 0
5/n-4/3 = 0
5*n^-1 = 4/3 // : 5
n^-1 = 4/15
-1 < 0
1/(n^1) = 4/15 // * n^1
1 = 4/15*n^1 // : 4/15
15/4 = n^1
n = 15/4
n = 15/4
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