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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
264/6 = 66/n // - 66/n
264/6-(66/n) = 0
264/6-66*n^-1 = 0
-66*n^-1 = -44 // : -66
n^-1 = 2/3
-1 < 0
1/(n^1) = 2/3 // * n^1
1 = 2/3*n^1 // : 2/3
3/2 = n^1
n = 3/2
n = 3/2
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