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(y^2)/3-(4/9) = 0
(y^2)/3-4/9 = 0
1/3*y^2 = 4/9 // : 1/3
y^2 = 4/3
y^2 = 4/3 // ^ 1/2
abs(y) = (4/3)^(1/2)
y = (4/3)^(1/2) or y = -(4/3)^(1/2)
y in { (4/3)^(1/2), -(4/3)^(1/2) }
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