Answer:
it would be 7x + 12 = 33.
Explanation:
Each friend pays 7 dollars, and there is an unknown amount of friends, making that x, so it is 7x. there is also another 12 dollars added on, but no variables involved, so that is the 12. The total cost is 33 dollars, so that is the end result, so it is 7x + 12 = 33