Answer:

Explanation:
In this question, we would be solving for r.
What this means is that we need to figure out what r is.
We would be using this equation:

We will get the r variables to one side and solve from there.
Solve:

When you're done solving, you should get -6.
This means that r = -6
I hope this helped you out.
Good luck on your academics.
Have a fantastic day!