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(2/3)*x^(1/3)-((5*x^(2/3))/3) = 0
(-5/3)*x^(2/3)+(2/3)*x^(1/3) = 0
2/3*x^(1/3)-5/3*x^(2/3) = 0
t_1 = x^(1/3)
2/3*t_1^1-5/3*t_1^2 = 0
2/3*t_1-5/3*t_1^2 = 0
DELTA = (2/3)^2-(-5/3*0*4)
DELTA = 4/9
DELTA > 0
t_1 = ((4/9)^(1/2)-2/3)/(-5/3*2) or t_1 = (-(4/9)^(1/2)-2/3)/(-5/3*2)
t_1 = 0 or t_1 = 2/5
t_1 = 0
x^(1/3)+0 = 0
x^(1/3) = 0
1*x^(1/3) = 0 // : 1
x^(1/3) = 0
x = 0
t_1 = 2/5
x^(1/3)-2/5 = 0
1*x^(1/3) = 2/5 // : 1
x^(1/3) = 2/5
x^(1/3) = 2/5 // ^ 3
x = 8/125
x in { 0, 8/125 }
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