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x in (-oo:+oo)
(x/3)*x = 1/4 // - 1/4
(x/3)*x-(1/4) = 0
(x/3)*x-1/4 = 0
1/3*x^2 = 1/4 // : 1/3
x^2 = 3/4
x^2 = 3/4 // ^ 1/2
abs(x) = (3/4)^(1/2)
x = (3/4)^(1/2) or x = -(3/4)^(1/2)
x in { (3/4)^(1/2), -(3/4)^(1/2) }
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