A very challenging question about fractions

Can you solve this challenging problem? Thanks to Ramesh for the suggestion!

0:00 Problem
1:18 Method 1
4:11 Method 2

(Sorry about the repost! In the previous video I had m = -1 by mistake around 3:05. I thank Andy Chen for alerting me of the typo! This is the original video: https://youtu.be/w6xul7j4t_U)

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