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x in (-oo:+oo)
x^2-(9/121) = 0
x^2-9/121 = 0
1*x^2 = 9/121 // : 1
x^2 = 9/121
x^2 = 9/121 // ^ 1/2
abs(x) = 3/11
x = 3/11 or x = -3/11
x in { 3/11, -3/11 }
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