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x in (-oo:+oo)
x^2 = 49/841 // - 49/841
x^2-(49/841) = 0
x^2-49/841 = 0
1*x^2 = 49/841 // : 1
x^2 = 49/841
x^2 = 49/841 // ^ 1/2
abs(x) = 7/29
x = 7/29 or x = -7/29
x in { 7/29, -7/29 }
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