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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = 6/4 // - 6/4
2/n-(6/4) = 0
2/n-3/2 = 0
2*n^-1 = 3/2 // : 2
n^-1 = 3/4
-1 < 0
1/(n^1) = 3/4 // * n^1
1 = 3/4*n^1 // : 3/4
4/3 = n^1
n = 4/3
n = 4/3
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