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x in (-oo:+oo)
0 = (1/3)*x^2-64 // - (1/3)*x^2-64
0-((1/3)*x^2)+64 = 0
(-1/3)*x^2+0+64 = 0
-1/3*x^2 = -64 // : -1/3
x^2 = 192
x^2 = 192 // ^ 1/2
abs(x) = 8*3^(1/2)
x = 8*3^(1/2) or x = -(8*3^(1/2))
x in { 8*3^(1/2), -(8*3^(1/2)) }
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