Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 1 - Section 1.4 - Basic Rules of Algebra - Exercise Set - Page 53: 23



Work Step by Step

The associative property for addition of real numbers states: $(a+b)+c=a+(b+c),$ that is, changing grouping does not affect the sum. Here, $7+(5+x)=$... apply the property $=(7+5)+x=$... solve the parentheses first... $=12+x$ $(7+5)+x=12+x$
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