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