Answer:
15 cups of coffee
which represents the total number of cups of coffee purchased from the card
Step-by-step explanation:
A = 45 - 3x
45 - 3x = A
45 - 3x = 0
( I kinda got lost here, but if it is a real problem for you like it was for me, I used Cymath, it was really helpful. )
I hope this helps.