Answered
It seems that the Solve ("Oplossen" in Dutch) command in GG is able to solve almost all polynomial equations exactly? I tried different equations of 3rd en 4rd degree with only non-integer solutions and GG was able to give me all the rational and irrational solutions exactly (square root of ...). I was wondering which algorithm is behind this command as it seems to be much more than just a simple Horner algorithm.
The same question 
It uses the Giac CAS engine
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