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(3*x^2)/2 = 4 // - 4
(3*x^2)/2-4 = 0
3/2*x^2 = 4 // : 3/2
x^2 = 8/3
x^2 = 8/3 // ^ 1/2
abs(x) = (8/3)^(1/2)
x = (8/3)^(1/2) or x = -(8/3)^(1/2)
x in { (8/3)^(1/2), -(8/3)^(1/2) }
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