Equation Puzzle  

"Yes, I am willing," I said.

She nodded gently and waved a fair hand; the next moment, a beautiful concentric circle of white shining runes appeared in front of me. There are nine layers of runes in these concentric circles that are spinning left and right.

"The first test is very simple; to solve this puzzle within three hours, as long as you do, you will become the librarian and will be able to move the library with you." The library spirit said.

I heard what she said but did not even acknowledge what she said as all my eyes focused on the wonderful thing in front of me. I have solved the runic puzzle now and then, but they were very different from this one, not only in difficulty but also in ingenuity.

It did not take me a minute to realize the rules of the puzzle. I will have to do the puzzle of each ring, which will give me a hint of an answer to solve the ring, and solving that would give me a hint ring below it.