Math Brain Teaser : What Do You Get?

Braingle’s Daily Brain Teaser for Jun 22, 2021

Looking at the 3 “equations” below, what is the answer to the 4th one?

8 + 2 = 16106

5 + 4 = 2091

9 + 6 = 54153

7 + 3 = ?

Check Braingle.com for the answer.