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z in (-oo:+oo)
z^2*((27*z^6-(12*z^5))/3) = 0
z^2*((27*z^6-12*z^5)/3) = 0
(z^2*(27*z^6-12*z^5))/3 = 0
27*z^6-12*z^5 = 0
3*z^5*(9*z-4) = 0
9*z-4 = 0 // + 4
9*z = 4 // : 9
z = 4/9
3*z^5*(z-4/9) = 0
(3*z^2*z^5*(z-4/9))/3 = 0
( 3*z^5 )
3*z^5 = 0 // : 3
z^5 = 0
z = 0
( z-4/9 )
z-4/9 = 0 // + 4/9
z = 4/9
( z^2 )
1*z^2 = 0 // : 1
z^2 = 0
z = 0
z in { 0, 4/9, 0 }
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