Answer:
r=2
Step-by-step explanation:
-3 - 2r/3 = -13 (1/3)
[(-3×3)-2r]/3 = -13/3
[-9-2r]/3 = -13/3
-9-2r = -13
-9+13 = 2r
4 = 2r
r = 4/2
r = 2
