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x in (-oo:+oo)
x*x = 25/289 // - 25/289
x*x-(25/289) = 0
x*x-25/289 = 0
1*x^2 = 25/289 // : 1
x^2 = 25/289
x^2 = 25/289 // ^ 1/2
abs(x) = 5/17
x = 5/17 or x = -5/17
x in { 5/17, -5/17 }
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