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x in (-oo:+oo)
5.2*x^2-(y/(2^3)) = 0
5.2*x^2 = -(-1/8*y) // : 5.2
x^2 = 0.02403846*y
x^2 = 0.02403846*y // ^ 1/2
abs(x) = 0.02403846^(1/2)*y^(1/2)
x = 0.02403846^(1/2)*y^(1/2) or x = -(0.02403846^(1/2)*y^(1/2))
x in { 0.02403846^(1/2)*y^(1/2), -(0.02403846^(1/2)*y^(1/2)) }
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