Answer:
b = 10
Explanation:
"7b - 2" is supplementary to "3b + 2"
7b - 2 + 3b + 2 = 180
7b + 3b - 2 + 2 = 180
10b + 0 = 180
10b/10 - 180/10
b = 18
4.5m questions
5.9m answers