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