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48-(4*x^2) = 16/3 // - 16/3
48-(4*x^2)-(16/3) = 0
48-4*x^2-16/3 = 0
-4*x^2 = -128/3 // : -4
x^2 = 32/3
x^2 = 32/3 // ^ 1/2
abs(x) = (32/3)^(1/2)
x = (32/3)^(1/2) or x = -(32/3)^(1/2)
x in { (32/3)^(1/2), -(32/3)^(1/2) }
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