The seventh level can no longer be considered as easy to solve. If you can do it, it shows you are starting to get a pretty good grasp of the puzzle. As usual you have to bring the wheels to the same configuration as the original one.
Original configuration
In case you get lost after making wrong moves, you can reset the two wheels to their starting positions using this button:
After you have done all the cases of level 7 you can give a try to the level 8.