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