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x in (-oo:+oo)
2569 = (5*x^2)/3+9 // - (5*x^2)/3+9
2569-((5*x^2)/3)-9 = 0
(-5/3)*x^2-9+2569 = 0
-5/3*x^2 = -2560 // : -5/3
x^2 = 1536
x^2 = 1536 // ^ 1/2
abs(x) = 16*6^(1/2)
x = 16*6^(1/2) or x = -(16*6^(1/2))
x in { 16*6^(1/2), -(16*6^(1/2)) }
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