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x in (-oo:+oo)
x^2-(1/16) = 0
x^2-1/16 = 0
1*x^2 = 1/16 // : 1
x^2 = 1/16
x^2 = 1/16 // ^ 1/2
abs(x) = 1/4
x = 1/4 or x = -1/4
x in { 1/4, -1/4 }
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