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x^5-((80/3)*x^3) = 0
x^5+(-80/3)*x^3 = 0
x^5-80/3*x^3 = 0
x^3*(x^2-80/3) = 0
1*x^2 = 80/3 // : 1
x^2 = 80/3
x^2 = 80/3 // ^ 1/2
abs(x) = (80/3)^(1/2)
x = (80/3)^(1/2) or x = -(80/3)^(1/2)
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { (80/3)^(1/2), -(80/3)^(1/2), 0 }
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