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Frozey
In order to find the answer to that, you must do cubed which is a^3=729. When you cube 729 you get 9 and if you multiply 9 by 9 by 9 you get 729. 

Thank me later :) 
I thinks it's 243. But I'm not sure. Really all you have to do is divide 729 by 3 and get 243. Idk maybe that's the answer.