Answer
zero
Work Step by Step
The sum of a number and its opposite (such as $5$ and $-5$) is always zero.
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.5 - Addition of Real Numbers - Concept and Vocabulary Check - Page 62: 2
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