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z in (-oo:+oo)
24*z^4-(z^2*((12*z^3)/4)) = 0
24*z^4-3*z^5 = 0
24*z^4-3*z^5 = 0
3*z^4*(8-z) = 0
8-z = 0 // - 8
-z = -8 // * -1
z = 8
3*z^4 = 0
3*z^4 = 0 // : 3
z^4 = 0
z = 0
z in { 8, 0 }
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