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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(5*(6/n))/n-1 = 1/3 // - 1/3
(5*(6/n))/n-(1/3)-1 = 0
(5*(6/n))/n-1/3-1 = 0
30*n^-2 = 4/3 // : 30
n^-2 = 2/45
-2 < 0
1/(n^2) = 2/45 // * n^2
1 = 2/45*n^2 // : 2/45
45/2 = n^2
n^2 = 45/2 // ^ 1/2
abs(n) = (45/2)^(1/2)
n = (45/2)^(1/2) or n = -(45/2)^(1/2)
n in { (45/2)^(1/2), -(45/2)^(1/2) }
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