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