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x in (-oo:+oo)
(x^2)/3 = 64 // - 64
(x^2)/3-64 = 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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