See please the attach
n=10-20 OK, n>20 - I can not get the answer.
More about this task
https://www.mdpi.com/2227-7390/10/19/3413

Roots-Portrait.sm (36.08 KiB) downloaded 1038 time(s).

Hi Valery. You need to add an eval for that.



Also can try to use the Draghilev's method and Mathcad block using the library in this post.



DraghilevSolveBlock-Tolstoi.sm (269.54 KiB) downloaded 1111 time(s).

Best regards.
Alvaro