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Lesson 4.1 - Addition Properties
Lesson 4.2 - Writing Expressions
Lesson 4.2 - Solving Expressions
Lesson 4.3a - Expressions with Variables
Lesson 4.3b - Solving Expressions with Variables
Lesson 4.4 - Addition and Subtraction Equations
Lesson 4.5 - Adding Equals to Equals
Lesson 4.7 - Patterns: Find a Rule