Answer
$r=-5/3$
Work Step by Step
We need to get the r alone. Thus, we cancel out the addition by subtracting 9 on both sides. This leaves us with the equation -3r=5. In order to cancel out multiplication, we use division, so we divide both sides of the equation by -3 to get that r=-5/3. We plug -5/3 in for r and confirm that our answer is, indeed, correct.