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12*x^2-(121/12) = 0
12*x^2-121/12 = 0
12*x^2 = 121/12 // : 12
x^2 = 121/144
x^2 = 121/144 // ^ 1/2
abs(x) = 11/12
x = 11/12 or x = -11/12
x in { 11/12, -11/12 }
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