Solve the equation

1. 23 = 7x
   
   
2. b + 8 = 12.2
   
   

you have a rack that can hold 30 CDs. you can fit 7 more CDs on the rack before the rack is full. Which equation models this situation appropriately, where x represents the number of CDs?

Ax + 30 = 7

Bx - 7 = 30

C7 + 30 = x

Dx + 7 = 30