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x in (-oo:+oo)
x^2 = 169/25 // - 169/25
x^2-(169/25) = 0
x^2-169/25 = 0
1*x^2 = 169/25 // : 1
x^2 = 169/25
x^2 = 169/25 // ^ 1/2
abs(x) = 13/5
x = 13/5 or x = -13/5
x in { 13/5, -13/5 }
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