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x in (-oo:+oo)
y = (1/6)*x^2 // - (1/6)*x^2
y-((1/6)*x^2) = 0
(-1/6)*x^2+y = 0
-1/6*x^2 = -y // : -1/6
x^2 = 6*y
x^2 = 6*y // ^ 1/2
abs(x) = 6^(1/2)*y^(1/2)
x = 6^(1/2)*y^(1/2) or x = -(6^(1/2)*y^(1/2))
x in { 6^(1/2)*y^(1/2), -(6^(1/2)*y^(1/2)) }
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