Answer:
r = r
Step-by-step explanation:
4(r + 20) = 1/5(20r + 400)
4r + 80 = 4r + 80
- 80 - 80
4r = 4r
4 4
no solution
4r + 80= 4r+ 80
-4r -4r
80= 80
Hope this helps
