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x in (-oo:+oo)
(7*x^2)/3 = 28 // - 28
(7*x^2)/3-28 = 0
7/3*x^2 = 28 // : 7/3
x^2 = 12
x^2 = 12 // ^ 1/2
abs(x) = 2*3^(1/2)
x = 2*3^(1/2) or x = -(2*3^(1/2))
x in { 2*3^(1/2), -(2*3^(1/2)) }
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