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Answer:
addition property of equality
Explanation:
The Addition Property of Equality says you can add the same value to both sides of an equation without changing the truth of it, and without changing the values of any variables.
Starting with ...
AB = BC
The addition property of equality says we can add x to both sides:
AB +x = BC +x
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Alternate perspective
If you start with the expression ...
AB +x
The substitution property of equality says that when AB = BC, it is true that ...
AB +x = BC +x