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Definition--Equation Concepts--Addition Property of Equality This is part of a collection of definitions on the topic of Equations. These downloadable images can easily be incorporated into a lesson.
Addition Property of Equality
Transitive Property (Definition and Examples)
Properties of Equality - Math Steps, Examples & Questions
Symmetric Property of Equality Overview & Examples - Lesson
Math Example: Solving One-Step Equations Using the Properties of Equality--Example 1
Addition Property of Equality, Definition, Explanation & Example - Video
Applying the Properties of Equalities 7th Grade Math Worksheets
Section 4.1 Discussion
Solving Simultaneous Equations: The Substitution Method and the Addition Method, Algebra Reference