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x in (-oo:+oo)
(2*x^2)/3 = 8 // - 8
(2*x^2)/3-8 = 0
2/3*x^2 = 8 // : 2/3
x^2 = 12
x^2 = 12 // ^ 1/2
abs(x) = 2*3^(1/2)
x = 2*3^(1/2) or x = -(2*3^(1/2))
x in { 2*3^(1/2), -(2*3^(1/2)) }
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