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x in (-oo:+oo)
(x^2)/2 = 112 // - 112
(x^2)/2-112 = 0
1/2*x^2 = 112 // : 1/2
x^2 = 224
x^2 = 224 // ^ 1/2
abs(x) = 4*14^(1/2)
x = 4*14^(1/2) or x = -(4*14^(1/2))
x in { 4*14^(1/2), -(4*14^(1/2)) }
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