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x in (-oo:+oo)
x^2-1 = 24/25 // - 24/25
x^2-(24/25)-1 = 0
x^2-24/25-1 = 0
1*x^2 = 49/25 // : 1
x^2 = 49/25
x^2 = 49/25 // ^ 1/2
abs(x) = 7/5
x = 7/5 or x = -7/5
x in { 7/5, -7/5 }
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