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X in (-oo:+oo)
X^2 = 25/64 // - 25/64
X^2-(25/64) = 0
X^2-25/64 = 0
1*X^2 = 25/64 // : 1
X^2 = 25/64
X^2 = 25/64 // ^ 1/2
abs(X) = 5/8
X = 5/8 or X = -5/8
X in { 5/8, -5/8 }
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