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n in (-oo:+oo)
(1/2)*(6*n-(4*n^3)) = 0
(1/2)*(6*n-4*n^3) = 0
1/2*(6*n-4*n^3) = 0
6*n-4*n^3 = 0
2*n*(3-2*n^2) = 0
-2*n^2 = -3 // : -2
n^2 = 3/2
n^2 = 3/2 // ^ 1/2
abs(n) = (3/2)^(1/2)
n = (3/2)^(1/2) or n = -(3/2)^(1/2)
2*n*(n-(3/2)^(1/2))*(n+(3/2)^(1/2)) = 0
1/2*2*n*(n-(3/2)^(1/2))*(n+(3/2)^(1/2)) = 0
( 1/2 )
1/2 = 0
n belongs to the empty set
( 2*n )
2*n = 0 // : 2
n = 0
( n+(3/2)^(1/2) )
n+(3/2)^(1/2) = 0 // - (3/2)^(1/2)
n = -(3/2)^(1/2)
( n-(3/2)^(1/2) )
n-(3/2)^(1/2) = 0 // + (3/2)^(1/2)
n = (3/2)^(1/2)
n in { 0, -(3/2)^(1/2), (3/2)^(1/2) }
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