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(4*x^2)/3 = 12 // - 12
(4*x^2)/3-12 = 0
4/3*x^2 = 12 // : 4/3
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3, -3 }
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