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x in (-oo:+oo)
x^(4/3) = 0.4096 // - 0.4096
x^(4/3)-0.4096 = 0
1*x^(4/3) = 0.4096 // : 1
x^(4/3) = 0.4096
x^(4/3) = 0.4096 // ^ 3
x^4 = 0.4096^3 // ^ 1/4
abs(x) = 0.4096^(3/4)
x = 0.4096^(3/4) or x = -0.4096^(3/4)
x in { 0.4096^(3/4), -0.4096^(3/4) }
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