Answer
x+84
Work Step by Step
The phrase "the sum of" tells us that we need to add x and 84, which we write as x+84.
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 - Chapter Review - Page 69: 8
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