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z in (-oo:+oo)
((5*z^1)/4)*((3*z^3)/4-(4*z^8)) = 0
((5*z)/4)*((3*z^3)/4-4*z^8) = 0
5/4*z*(3/4*z^3-4*z^8) = 0
3/4*z^3-4*z^8 = 0
z^3*(3/4-4*z^5) = 0
-4*z^5 = -3/4 // : -4
z^5 = 3/16
z^5 = 3/16 // ^ 1/5
z = (3/16)^(1/5)
z^3*(z-(3/16)^(1/5)) = 0
5/4*z*z^3*(z-(3/16)^(1/5)) = 0
( 5/4*z )
5/4*z = 0 // : 5/4
z = 0
( z-(3/16)^(1/5) )
z-(3/16)^(1/5) = 0 // + (3/16)^(1/5)
z = (3/16)^(1/5)
( z^3 )
1*z^3 = 0 // : 1
z^3 = 0
z = 0
z in { 0, (3/16)^(1/5), 0 }
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