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((1/2)*x^2)/3-(1/4) = 0
((1/2)*x^2)/3-1/4 = 0
1/6*x^2 = 1/4 // : 1/6
x^2 = 3/2
x^2 = 3/2 // ^ 1/2
abs(x) = (3/2)^(1/2)
x = (3/2)^(1/2) or x = -(3/2)^(1/2)
x in { (3/2)^(1/2), -(3/2)^(1/2) }
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