Watch this video. This is an introduction to a hands-on (well, almost) exercise of finding the weight of Spice Man by keeping the scale balanced. To locate the link to the exercise, note that there is a list of videos (marked by a camera symbol) and exercises (marked by a star) on the left-hand side of the page. The link to the current video ("One Step Equation Intuition Exercise Intro") is highlighted in gray, and below this appears the link to the exercise ("One Step Equation Intuition"). Please click on this link, and complete the exercise.