Answer:
6 frames in each box
Step-by-step explanation:
1. frames in the box- broken frames= frames that can be sold
2. f= frames in each box
3. 8f - 3 = 45
4. isolate the variable : add 3 to each side
5. 8f=48
6. divide both sides by 8 = 48/8=6
7. 6 frames in each box