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x in (-oo:+oo)
(24/(-3))*x^2+5+18 = 0
-8*x^2 = -23 // : -8
x^2 = 23/8
x^2 = 23/8 // ^ 1/2
abs(x) = (23/8)^(1/2)
x = (23/8)^(1/2) or x = -(23/8)^(1/2)
x in { (23/8)^(1/2), -(23/8)^(1/2) }
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