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x in (-oo:+oo)
(1/64)*x^3 = (4/25)*x // - (4/25)*x
(1/64)*x^3-((4/25)*x) = 0
(1/64)*x^3+(-4/25)*x = 0
1/64*x^3-4/25*x = 0
x*(1/64*x^2-4/25) = 0
1/64*x^2 = 4/25 // : 1/64
x^2 = 256/25
x^2 = 256/25 // ^ 1/2
abs(x) = 16/5
x = 16/5 or x = -16/5
x = 0
x = 0
x in { 16/5, -16/5, 0 }
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