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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/5 = 6/n // - 6/n
12/5-(6/n) = 0
12/5-6*n^-1 = 0
-6*n^-1 = -12/5 // : -6
n^-1 = 2/5
-1 < 0
1/(n^1) = 2/5 // * n^1
1 = 2/5*n^1 // : 2/5
5/2 = n^1
n = 5/2
n = 5/2
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