In this video you will learn how to set up a One-Step equation and why we must do the same mathematical operation to BOTH sides.
Source: http://www.youtube.com/watch?v=kbqO0YTUyAY
In this video you will learn how to solve a simple One-Step equation using addition and subtraction.
Source: http://www.youtube.com/watch?v=jWpiMu5LNdg