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