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