Students compete in teams of 4 or 5 to correctly solve multi-step equations. Each student completes one step of the solution, and then passes the work to the next team member. The next team member checks the work, and then completes the next step. The final step is plugging the solution in to the original to check.
This activity has students working collaboratively, but still independently.
I have included 5 separate relays, which can be used separately, or you can give each student in the team a different starting problem, so that each student is engaged at all times.