I'm trying to figure this out. It's one exercise of a set of 20, but this is the only one giving me problems.
The teacher of the course mentioned that it has to be done with two circumferences (the third move is the parallel line itself). So far I know that the two centers cannot be both on the given line or one in the point and the other in the line (none of the intersections give a parallel that way).
Solutions commonly found in the internet don't work since they go way over the three movement limit. The closest one I found required three circumferences (and therefore 4 moves).
Thank you for your time.