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