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variables in fill in the blank questions

Amy Rountree

How do I program my answers for fill in the blank math expressions to allow any letter as a variable? I feel bad when students get an answer wrong just because they choose c as a variable instead of the one I programmed in. Is there a way to do this? I'm getting around it now by specifying in the question what variable to use but it would be nice to give students latitude. 

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Bruce Sharp

I know it can be done with RegEx. I just don't know how to code RegEx myself. Hopefully, someone who knows how will chime in. :)

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