Learning goals: Teacher Facing Compare and contrast (orally) different strategies for solving an equation of the form $px+q=r$. Explain (orally and in writing) how to use a balanced hanger diagram to solve an equation of the form $px+q=r$. Interpret a balanced hanger diagram, and write an equation of the form $px+q=r$ to represent the relationship shown. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.6 Expressions, Equations, and Inequalities, Grade 7.