Answer:
Hello the answer is - 4
Step-by-step explanation:
[tex]9 = - 3 - 3r \\ 9 + 3 = - 3r \\ - 3r = 12 \\ r = \frac{12}{ - 3} = - 4[/tex]
-4
-3r-3=9
9+3=-3r
12=-3r
12/-3=-3/-3r
-4=r
