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