Answer
Associative Property.
Work Step by Step
This property states that $(a+b)+c=a+(b+c)$.
Plug in $x$ as $a$, $2y$ as $b$, and $3z$ as $c$ and you will see the associative property being used.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.2 - Real Numbers - P.2 Exercises - Page 15: 13
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