Automatically remove content from cells based on other cell value

Hello,

This is for Excel 2010

If i have "x" in cell A2 and I type "x" in cell A1, is there a way to remove the contents from A2 if I type the same in another? and if i delete "X" from cell A1, can A2 populate with "x" again / automatically?

Hope this makes sense and is possible.

Thanks,

Unbound237