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x in (-oo:+oo)
z/5-5 = (2*x^2)/3 // - (2*x^2)/3
z/5-((2*x^2)/3)-5 = 0
(-2/3)*x^2+z/5-5 = 0
-2/3*x^2 = -(1/5*z-5) // : -2/3
x^2 = -3/2*(5-(1/5*z))
x^2 = -3/2*(5-1/5*z) // ^ 1/2
abs(x) = (-3/2)^(1/2)*(5-1/5*z)^(1/2)
x = (-3/2)^(1/2)*(5-1/5*z)^(1/2) or x = -((-3/2)^(1/2)*(5-1/5*z)^(1/2))
x in { (-3/2)^(1/2)*(5-1/5*z)^(1/2), -((-3/2)^(1/2)*(5-1/5*z)^(1/2)) }
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