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(1/5)*x^5-((4/3)*x^3) = 0
(1/5)*x^5+(-4/3)*x^3 = 0
1/5*x^5-4/3*x^3 = 0
x^3*(1/5*x^2-4/3) = 0
1/5*x^2 = 4/3 // : 1/5
x^2 = 20/3
x^2 = 20/3 // ^ 1/2
abs(x) = (20/3)^(1/2)
x = (20/3)^(1/2) or x = -(20/3)^(1/2)
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { (20/3)^(1/2), -(20/3)^(1/2), 0 }
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