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(1/4)*x^3-(x/3) = 0
1/4*x^3-1/3*x = 0
x*(1/4*x^2-1/3) = 0
1/4*x^2 = 1/3 // : 1/4
x^2 = 4/3
x^2 = 4/3 // ^ 1/2
abs(x) = (4/3)^(1/2)
x = (4/3)^(1/2) or x = -(4/3)^(1/2)
x = 0
x = 0
x in { (4/3)^(1/2), -(4/3)^(1/2), 0 }
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