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x in (-oo:+oo)
(2*x*x)/2 = 338 // - 338
(2*x*x)/2-338 = 0
1*x^2 = 338 // : 1
x^2 = 338
x^2 = 338 // ^ 1/2
abs(x) = 13*2^(1/2)
x = 13*2^(1/2) or x = -(13*2^(1/2))
x in { 13*2^(1/2), -(13*2^(1/2)) }
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