Answer
Always
Work Step by Step
When you add by 0, nothing changes, so x +0=x will always be true. Therefore, your answer is always.
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 1 - Foundations for Algebra - Concept Byte - Always, Sometimes, or Never - Page 37: 21
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