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 than wrappers Danny found at the park. 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 he must have found (x - w) more bottle caps than wrappers. 

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 he must have (y + z) bottle caps and wrappers in his collection. 

Therefore, the answer (symbolic expression) is: 

x - w + y + z