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