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