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x in (-oo:+oo)
20 = (1/3)*x^2 // - (1/3)*x^2
20-((1/3)*x^2) = 0
(-1/3)*x^2+20 = 0
-1/3*x^2 = -20 // : -1/3
x^2 = 60
x^2 = 60 // ^ 1/2
abs(x) = 2*15^(1/2)
x = 2*15^(1/2) or x = -(2*15^(1/2))
x in { 2*15^(1/2), -(2*15^(1/2)) }
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