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x in (-oo:+oo)
2880 = 15*(1/3)*x^2 // - 15*(1/3)*x^2
2880-(15*(1/3)*x^2) = 0
2880-5*x^2 = 0
-5*x^2 = -2880 // : -5
x^2 = 576
x^2 = 576 // ^ 1/2
abs(x) = 24
x = 24 or x = -24
x in { 24, -24 }
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