Learning goals: Teacher Facing Explain (orally, in writing, and using other representations) how the distributive and commutative properties apply to expressions with negative coefficients. Justify (orally and in writing) whether expressions are equivalent, including rewriting subtraction as adding the opposite. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.6 Expressions, Equations, and Inequalities, Grade 7.