Answer:

Explanation:
In this question, we're going to need to use the distributive property.
In this case, we would distribute the 5 to each of the terms inside the parenthesis.
We're distributing this expression:

Lets solve:

When you're done solving, you should get 15a-10b-20
This means that 15a-10b-20 would be your answer.
I hope this helped you out.
Good luck on your academics.
Have a fantastic day!