Answer
Subtracting a number is the same as adding the opposite number.
Work Step by Step
For instance:
$3-3=0$
but
$3+(-3)=3-3=0$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Lesson Check - Page 33: 8
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