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n in (-oo:+oo)
(2/3)*n^2-6 = 2 // - 2
(2/3)*n^2-6-2 = 0
2/3*n^2 = 8 // : 2/3
n^2 = 12
n^2 = 12 // ^ 1/2
abs(n) = 2*3^(1/2)
n = 2*3^(1/2) or n = -(2*3^(1/2))
n in { 2*3^(1/2), -(2*3^(1/2)) }
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