This algebraic form was created as a handout for my students. Finding the unknown proved to be a bit easier for most of my students, however remembering where and how to plug the "unknown" back into the equation became a bit harder to remember for some of my students. I colored in red the next step as we walked through the problem and had my students write a line at the beginning of the problem, directly over the "unknown" we needed to figure out. This handout became a great help to both my students and parents as well!