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3*x^4 = 80*x^(2/3) // - 80*x^(2/3)
3*x^4-(80*x^(2/3)) = 0
3*x^4-80*x^(2/3) = 0
t_1 = x^(2/3)
3*t_1^6-80*t_1^1 = 0
3*t_1^6-80*t_1 = 0
t_1*(3*t_1^5-80) = 0
3*t_1^5 = 80 // : 3
t_1^5 = 80/3
t_1^5 = 80/3 // ^ 1/5
t_1 = (80/3)^(1/5)
t_1 = 0
t_1 = 0
t_1 = (80/3)^(1/5)
x^(2/3)-(80/3)^(1/5) = 0
1*x^(2/3) = (80/3)^(1/5) // : 1
x^(2/3) = (80/3)^(1/5)
x^(2/3) = (80/3)^(1/5) // ^ 3
x^2 = (80/3)^(3/5) // ^ 1/2
abs(x) = (80/3)^(3/10)
x = (80/3)^(3/10) or x = -(80/3)^(3/10)
t_1 = 0
x^(2/3)+0 = 0
x^(2/3) = 0
1*x^(2/3) = 0 // : 1
x^(2/3) = 0
x = 0
x in { (80/3)^(3/10), -(80/3)^(3/10), 0 }
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