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x in (-oo:+oo)
((4*x)/5)*x = 23/3 // - 23/3
((4*x)/5)*x-(23/3) = 0
((4*x)/5)*x-23/3 = 0
4/5*x^2 = 23/3 // : 4/5
x^2 = 115/12
x^2 = 115/12 // ^ 1/2
abs(x) = (115/12)^(1/2)
x = (115/12)^(1/2) or x = -(115/12)^(1/2)
x in { (115/12)^(1/2), -(115/12)^(1/2) }
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