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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
Eureka Math/EngageNY
6th grade (Eureka Math/EngageNY)
Module 4: Expressions and equations
Topic D: Expanding, factoring, and distributing expressions
Combining like terms
Combining like terms
Sal explains why 4a + 2a = 6a several ways
License: CC BY-NC-SA by Khan Academy