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Add or Subtract a value from a macro's value
I think this is an easy question, but I've been at it for far too long now.
OK, I've got a macro "NumberExamples" which is just a macro which gives me the number of examples for a certain attribute.
The thing I want to do is add or subtract a number from that value, so let's say the value of "NumberExamples" = 14. I want to do this 14+1 and make it 15, or 14-3 and make it 11.
However, when I try to do this with generate macro it literally adds the 1 to the number making it 141.
I know that this is probably very straightforward, I just don't know how.