We set up the problem first.
5/6 + 5/8 - 1/2.
We would first find a common denominator. It is 24.
Then we see how many times can 24 go into 6, 8, and 2.
We make them into improper or regular fractions, and we subtract regularly.
20/24 + 15/24 - 12/24 = 23/24.
So your answer would be 23/24.
Hope this helps☻