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