Learning goals: Teacher Facing Generalize (orally) that doing the same thing to each side of an equation generates an equivalent equation. Solve equations of the form $px+q=r$ or $p(x+q)=r$ that involve negative numbers, and explain (orally and in writing) the solution method. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.6 Expressions, Equations, and Inequalities, Grade 7.