Can anybody solve this : Simplify 36^7/2-36^9/2/36^5/2

Here is the link for the answer to a similar query:
https://www.meritnation.com/ask-answer/question/2-36-1-2-36-3-2-b-7x81-1-2-81-1-2-81-3-2/math/2667069

Please follow solution 2 of the above given link.