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x in (-oo:+oo)
x^2 = 49/121 // - 49/121
x^2-(49/121) = 0
x^2-49/121 = 0
1*x^2 = 49/121 // : 1
x^2 = 49/121
x^2 = 49/121 // ^ 1/2
abs(x) = 7/11
x = 7/11 or x = -7/11
x in { 7/11, -7/11 }
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