Lesson objective: Solve two-step equations by performing the same operation on both sides.

This lesson helps to build procedural skill with two-step equations. This work develops students' understanding that performing operations to both sides of an equation preserves the equality of the two expressions.

Students engage in Mathematical Practice 7 (look for and make use of structure) as they check if numbers are solutions to an equation, and once an equation is solved that each step of solving has the same solution as the previous step.

**Key vocabulary:**

- equivalent equations
- solution
- solve