Request for suggestions: algebraic equations in Free42

[johanw]

For that kind of solving I usually use this app: https://play.google.com/store/apps/detai...ab.android (oh well, its cracked paid version because the version I bought refuses to run on a device without a Google account).

But there is room for improvement there, it can solve a general 3rd order equation symbolic but fails for a 4rth order, while I remember having seen once a proof that 4rth and lower equtions are exact solvable (seen != understood. I was a 1st year student then).