Answer:
Multiply both sides by 2
Subtract l from both sides
Divide each side by 3
(2R -l)/3 =w
Step-by-step explanation:
R = (l+3w)/2
2R = 2* (l+3w)
2R = l+3w
2R - l = l-l +3w
2R -l = 3w
(2R-l) /3 = 3w/3
1. Multiply both sides by 2 ----------> 2R = l + 3w
2. Subtract l from both sides ----> 2R - l = 3w
3. Divides both sides by 3 ----> (2R - l) / 3 = w
