You can put this solution on YOUR website! IN ALGEBRA
2A+2B=2A+2B...THAT IS ALL NO FURTHER SIMPLIFICATION POSSIBLE.
YOU CAN IMAGINE 2A TO MEAN 2 APPLES AND 2B TO MEAN 2 BERRIES.IF YOU ADD THEM YOU WILL STILL SAY YOU HAVE 2 APPLES AND 2 BERRIES ONLY..YO CANT SAY YOU HAVE 4 APPLES OR 4 BERRIES OR ANY SUCH THING,IDENTIFYING THE DIFFERENT THINGS.