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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 6/15 // - 6/15
3/n-(6/15) = 0
3/n-2/5 = 0
3*n^-1 = 2/5 // : 3
n^-1 = 2/15
-1 < 0
1/(n^1) = 2/15 // * n^1
1 = 2/15*n^1 // : 2/15
15/2 = n^1
n = 15/2
n = 15/2
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