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