Rebecca wants to split a collection of marbles into groups of w. Rebecca has x eggs and y marbles. How many groups will be created?
First, we need to find out how many marbles Rebecca has in total. We know that she has x eggs and y marbles, which means she has x + y marbles in total. 

Now, we need to find out how many groups will be created. To do this, we need to divide the total number of marbles by the number of marbles in each group. We know that each group has w marbles, so the total number of groups will be (x + y)/w. 

Therefore, the answer (symbolic expression) is: 

(x + y)/w