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x in (-oo:+oo)
(1/3)*x^2 = 13/6 // - 13/6
(1/3)*x^2-(13/6) = 0
(1/3)*x^2-13/6 = 0
1/3*x^2 = 13/6 // : 1/3
x^2 = 13/2
x^2 = 13/2 // ^ 1/2
abs(x) = (13/2)^(1/2)
x = (13/2)^(1/2) or x = -(13/2)^(1/2)
x in { (13/2)^(1/2), -(13/2)^(1/2) }
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