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x in (-oo:+oo)
(15/2)*x^2 = 15/5-x^2 // - 15/5-x^2
(15/2)*x^2+x^2-(15/5) = 0
(15/2)*x^2+x^2-3 = 0
17/2*x^2 = 3 // : 17/2
x^2 = 6/17
x^2 = 6/17 // ^ 1/2
abs(x) = (6/17)^(1/2)
x = (6/17)^(1/2) or x = -(6/17)^(1/2)
x in { (6/17)^(1/2), -(6/17)^(1/2) }
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