Learning goals: Teacher Facing Calculate a value that is a solution to a linear equation in one variable, and explain (orally) the steps used to solve. Create an expression to represent a number puzzle, and justify (orally) that it is equivalent to another expression. Justify (orally) that each step used in solving a linear equation maintains equality. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.4 Linear Equations and Linear Systems, Grade 8.