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