Yeah, I just checked. The `f20` polynomial for this (from Dummit's paper) 
is:

f20 = x**6 + 125*x**3 - 3233*x + 3098

For solvable quintics, this need to have a linear factor. Here, since f20 
is irreducible, quintic is unsolvable and the solve function falls back to 
the usual RootOf based solution.

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