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x in (-oo:+oo)
y = (1/8)*x^2+2 // - (1/8)*x^2+2
y-((1/8)*x^2)-2 = 0
(-1/8)*x^2+y-2 = 0
-1/8*x^2 = -(y-2) // : -1/8
x^2 = -8*(2-y)
x^2 = -8*(2-y) // ^ 1/2
abs(x) = (-8)^(1/2)*(2-y)^(1/2)
x = (-8)^(1/2)*(2-y)^(1/2) or x = -((-8)^(1/2)*(2-y)^(1/2))
x in { (-8)^(1/2)*(2-y)^(1/2), -((-8)^(1/2)*(2-y)^(1/2)) }
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