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x in (-oo:+oo)
(1/2)*x^2 = 16 // - 16
(1/2)*x^2-16 = 0
1/2*x^2 = 16 // : 1/2
x^2 = 32
x^2 = 32 // ^ 1/2
abs(x) = 4*2^(1/2)
x = 4*2^(1/2) or x = -(4*2^(1/2))
x in { 4*2^(1/2), -(4*2^(1/2)) }
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