This site teaches Reasoning with Equations and Inequalities to High Schoolers through a series of 5909 questions and interactive activities aligned to 36 Common Core mathematics skills.

Students solve multistep equations (with variables on only one side).  Students choose between two models/equations at each of six points in this Google Form activity.

Solving multistep linear equations.Mathematics Instructional Plans (MIPs) help teachers align instruction with the Mathematics Standards of Learning (SOL) by providing examples of how the knowledge, skills and processes found in the SOL and curriculum framework can be presented to students in the classroom.

Description
Overview: This lesson unit is intended to help teachers assess how well students are able to: form and solve linear equations involving factorizing and using the distributive law. In particular, this unit aims to help teachers identify and assist students who have difficulties in: using variables to represent quantities in a real-world or mathematical problem and solving word problems leading to equations of the form px + q = r and p(x + q) = r.
Subject: Algebra Level: Lower Primary, Upper Primary, Middle School, High School Grades: Kindergarten, Grade 1, Grade 2, Grade 3, Grade 4, Grade 5, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, Grade 11, Grade 12 Material Type: Assessment, Lesson Plan Provider: Shell Center for Mathematical Education, U.C. Berkeley Provider Set: Mathematics Assessment Project (MAP), Mathematics Assessment Project (MAP) Date Added: 04/26/2013
License: Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Media Format: Downloadable docs, Text/HTML

This is a practice activity for solving equations with variables on both sides.  It is self-checking, so if students solve their problem carefully and accurately, they will know which problem to solve next.   Once all problems have been completed, the final answer will take students back to the problem they started with.