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