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