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