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X in (-oo:+oo)
X^2 = 25/16 // - 25/16
X^2-(25/16) = 0
X^2-25/16 = 0
1*X^2 = 25/16 // : 1
X^2 = 25/16
X^2 = 25/16 // ^ 1/2
abs(X) = 5/4
X = 5/4 or X = -5/4
X in { 5/4, -5/4 }
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