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z in (-oo:+oo)
4*z^(1/3)*(2*z^(2/3)-(3*z^6)) = 0
4*z^(1/3)*(2*z^(2/3)-3*z^6) = 0
2*z^(2/3)-3*z^6 = 0
z^(2/3)*(2-3*z^(16/3)) = 0
-3*z^(16/3) = -2 // : -3
z^(16/3) = 2/3
z^(16/3) = 2/3 // ^ 3
z^16 = 8/27 // ^ 1/16
abs(z) = (8/27)^(1/16)
z = (8/27)^(1/16) or z = -(8/27)^(1/16)
z^(2/3)*(z-(8/27)^(1/16))*(z+(8/27)^(1/16)) = 0
4*z^(1/3)*z^(2/3)*(z-(8/27)^(1/16))*(z+(8/27)^(1/16)) = 0
( 4*z^(1/3) )
4*z^(1/3) = 0 // : 4
z^(1/3) = 0
z = 0
( z+(8/27)^(1/16) )
z+(8/27)^(1/16) = 0 // - (8/27)^(1/16)
z = -(8/27)^(1/16)
( z-(8/27)^(1/16) )
z-(8/27)^(1/16) = 0 // + (8/27)^(1/16)
z = (8/27)^(1/16)
( z^(2/3) )
1*z^(2/3) = 0 // : 1
z^(2/3) = 0
z = 0
z in { 0, -(8/27)^(1/16), (8/27)^(1/16), 0 }
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