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x in (-oo:+oo)
X+x^2 = 5/4 // - 5/4
X+x^2-(5/4) = 0
X+x^2-5/4 = 0
1*x^2 = -(X-5/4) // : 1
x^2 = 5/4-X
x^2 = 5/4-X // ^ 1/2
abs(x) = (5/4-X)^(1/2)
x = (5/4-X)^(1/2) or x = -(5/4-X)^(1/2)
x in { (5/4-X)^(1/2), -(5/4-X)^(1/2) }
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