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((4/5)*x^4)/3 = 2*x // - 2*x
((4/5)*x^4)/3-(2*x) = 0
((4/5)*x^4)/3-2*x = 0
4/15*x^4-2*x = 0
2*x*(2/15*x^3-1) = 0
2/15*x^3 = 1 // : 2/15
x^3 = 15/2
x^3 = 15/2 // ^ 1/3
x = (15/2)^(1/3)
2*x = 0
2*x = 0 // : 2
x = 0
x in { (15/2)^(1/3), 0 }
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