When talking about factoring algebraic expressions, there is always a chance that the equation doesn't have any common variables. Maybe one or two of the four or six variables are the same, but not more than that. In this case, we have to group the variables that have a lot in common, leave the ones that don't fit, and try to find things that they all have in common. When we do this, we can find common factors and put them in the right brackets. This makes it possible to find the factors of an algebraic expression. This is called regrouping, and it's a key step in factoring algebraic expressions.