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x in (-oo:+oo)
x^2 = 4/16 // - 4/16
x^2-(4/16) = 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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