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