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x in (-oo:+oo)
x^2 = 9/256 // - 9/256
x^2-(9/256) = 0
x^2-9/256 = 0
1*x^2 = 9/256 // : 1
x^2 = 9/256
x^2 = 9/256 // ^ 1/2
abs(x) = 3/16
x = 3/16 or x = -3/16
x in { 3/16, -3/16 }
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