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x in (-oo:+oo)
x^2-(121/4) = 0
x^2-121/4 = 0
1*x^2 = 121/4 // : 1
x^2 = 121/4
x^2 = 121/4 // ^ 1/2
abs(x) = 11/2
x = 11/2 or x = -11/2
x in { 11/2, -11/2 }
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