Got it! Here you go!
Explanation:
It seems you already know that you need to do 17-2/3(not two thirds, just over 3.)
The horizontal line means divide, so you will be dividing by 3. First, though,, you do...
17-2(which is 15)
and then divide it by 3.
15/3=5
Your answer is 5.
I hope I helped! Have a great day.