Grade 6 > Standards for Mathematical Practice > Expressions & Equations > Apply and extend previous understandings of arithmetic to algebraic expressions > CCSS.MATH.CONTENT.6.EE.A.4
Identify when two expressions are equivalent (i.e., when the two expressions name the same number regardless of which value is substituted into them). For example, the expressions y + y + y and 3y are equivalent because they name the same number regardless of which number y stands for.
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