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X in (-oo:+oo)
X^2-(25/2) = 0
X^2-25/2 = 0
1*X^2 = 25/2 // : 1
X^2 = 25/2
X^2 = 25/2 // ^ 1/2
abs(X) = (25/2)^(1/2)
X = (25/2)^(1/2) or X = -(25/2)^(1/2)
X in { (25/2)^(1/2), -(25/2)^(1/2) }
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