Reconstructing a Beginning Account Balance Please HELP!?!?!?

Question

During the month, services performed for customers on account amounted to $7,960, and collections from customers in payment of their accounts totaled $6,350. At the end of the month, the Accounts Receivable account had a balance of $3,130. What was the Accounts Receivable balance at the beginning of the month?

Please Provide numeric answer.

Answer 1

Beginning a/c balance ?
Add:
Svcs performed on a/c 7,960
Less:
Received from customer (6,350)
= Ending a/c balance 3,130

? + 7,960 - 6,350 = 3,130
? = 3,130 - 7,960 + 6,350 = 1,520 beginning a/c balance