Danny collects bottle caps and wrappers. He found w wrappers and x bottle caps at the park. Now he has y bottle caps and z wrappers in his collection. How many more bottle caps than wrappers did danny find at the park?
First, we need to find out how many more bottle caps Danny found at the park than wrappers. To do this, we need to subtract the number of wrappers from the number of bottle caps. We know that Danny found w wrappers and x bottle caps at the park, so the number of bottle caps must be x - w. 

Now, we need to find out how many bottle caps and wrappers Danny has in his collection. We know that he has y bottle caps and z wrappers in his collection. This means that the total number of bottle caps and wrappers must be y + z. 

Therefore, the answer (symbolic expression) is: 

x - w + y + z