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x in (-oo:+oo)
(5*x^2)/8 = 2*x^3 // - 2*x^3
(5*x^2)/8-(2*x^3) = 0
(5*x^2)/8-2*x^3 = 0
5/8*x^2-2*x^3 = 0
x^2*(5/8-2*x) = 0
5/8-2*x = 0 // - 5/8
-2*x = -5/8 // : -2
x = -5/8/(-2)
x = 5/16
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 5/16, 0 }
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