Figuring out the difference in value between 2 fields

[Jason Pruim]

Okay, so I have been gooling all over trying to figure this out. I'm  
sure it's easy enough to do, but I can't seem to find it.

All I want to do is figure out the difference between 2 fields. IE:
Field 1= 20
Field 2 =10
Difference between Field 1 & 2 is: 10

Any ideas?



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