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