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