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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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