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3*x^(5/3)-(20*x) = 0
3*x^(5/3)-20*x = 0
3*x^(5/3)-20*x = 0
x*(3*x^(2/3)-20) = 0
3*x^(2/3) = 20 // : 3
x^(2/3) = 20/3
x^(2/3) = 20/3 // ^ 3
x^2 = 8000/27 // ^ 1/2
abs(x) = (8000/27)^(1/2)
x = (8000/27)^(1/2) or x = -(8000/27)^(1/2)
x = 0
x = 0
x in { (8000/27)^(1/2), -(8000/27)^(1/2), 0 }
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