Answer
Commutative property of addition
Work Step by Step
We are given that $(3+x)+7=7+(3+x)$.
This is an example of the commutative property of addition, which holds that $a+b=b+a$.
In this example, $a=(3+x)$ and $b=7$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 1 - Review - Page 45: 98
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