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x in (-oo:+oo)
x^3 = (4*(4*x)^1)/3 // - (4*(4*x)^1)/3
x^3-((4*(4*x)^1)/3) = 0
x^3+(-16/3)*x = 0
x^3-16/3*x = 0
x*(x^2-16/3) = 0
1*x^2 = 16/3 // : 1
x^2 = 16/3
x^2 = 16/3 // ^ 1/2
abs(x) = (16/3)^(1/2)
x = (16/3)^(1/2) or x = -(16/3)^(1/2)
x = 0
x = 0
x in { (16/3)^(1/2), -(16/3)^(1/2), 0 }
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