Point S on the number line shows Samuel's score after the first round of a quiz: A number line is shown from negative 8 to 0 to positive 8. There are increments of 1 on either side of the number line. The even numbers are labeled on either side of the number line. Point S is shown on 2. In round 2, he lost 7 points. Which expression shows how many total points he has at the end of round 2?