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