[Public version of] Equation Pan Balance

Interactive pan balance for solving equations. Built atop the Equation Hangers activity by Shelley Caranza and Desmos: https://teacher.desmos.com/activitybuilder/custom/5e83b2f431f2250b71a8a00c#preview/ccdee536-c938-4c86-b85c-f8547c67ca5f

By Kevin Hall