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x in (-oo:+oo)
(3*4*x*x)/2 = 24 // - 24
(3*4*x*x)/2-24 = 0
6*x^2 = 24 // : 6
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in { 2, -2 }
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