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