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z in (-oo:+oo)
24*z^6-(z^3*((21*z^4)/3)) = 0
24*z^6-7*z^7 = 0
24*z^6-7*z^7 = 0
z^6*(24-7*z) = 0
24-7*z = 0 // - 24
-7*z = -24 // : -7
z = -24/(-7)
z = 24/7
z^6 = 0
1*z^6 = 0 // : 1
z^6 = 0
z = 0
z in { 24/7, 0 }
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