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(1/3)*x^5-x^7 = 0
1/3*x^5-x^7 = 0
x^5*(1/3-x^2) = 0
-1*x^2 = -1/3 // : -1
x^2 = 1/3
x^2 = 1/3 // ^ 1/2
abs(x) = (1/3)^(1/2)
x = (1/3)^(1/2) or x = -(1/3)^(1/2)
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in { (1/3)^(1/2), -(1/3)^(1/2), 0 }
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