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(3*y^2)/5-(1/5) = 0
(3*y^2)/5-1/5 = 0
3/5*y^2 = 1/5 // : 3/5
y^2 = 1/3
y^2 = 1/3 // ^ 1/2
abs(y) = (1/3)^(1/2)
y = (1/3)^(1/2) or y = -(1/3)^(1/2)
y in { (1/3)^(1/2), -(1/3)^(1/2) }
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