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