Answer:
r = -2/3
Step-by-step explanation:
-3(r-1/3)=3
Divide each side by -3
-3/-3(r-1/3)=3/-3
r - 1/3 = -1
Add 1/3 to each side
r - 1/3 +1/3 = -1 + 1/3
Get a common denominator
r = -3/3+ 1/3
