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X in (-oo:+oo)
(X^2)/2 = 25 // - 25
(X^2)/2-25 = 0
1/2*X^2 = 25 // : 1/2
X^2 = 50
X^2 = 50 // ^ 1/2
abs(X) = 5*2^(1/2)
X = 5*2^(1/2) or X = -(5*2^(1/2))
X in { 5*2^(1/2), -(5*2^(1/2)) }
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