Some campers went rowing in the morning while w campers went rowing in the afternoon. If a total of x campers went rowing that day How many campers went rowing in the morning?
First, we need to find out how many campers went rowing in the morning. We know that some campers went rowing in the morning, and we know that a total of x campers went rowing that day. This means that the number of campers who went rowing in the morning must be x - w campers. 

Therefore, the answer (symbolic expression) is: 

x - w