Solve using the multiplication principle don't forget to check

The answer will be r = 9/2.

Here is how I got that

First, we must simplify both sides of this equation.
-3/2r = -27/4
Next, we must multiply both sides by 2/(-3).
(2/-3) * (-3/2r) = (2/-3) * (-27/4)
Then we get the answer.
r = 9/2

I hope this helps! :>