Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 6 - Algebra: Equations and Inequalities - Chapter Summary, Review, and Test - Review Exercises - Page 403: 14

Answer

\[\left\{ x:x\text{ is a real number} \right\}\].

Work Step by Step

Consider the equation\[7x+13=2\left( 2x-5 \right)+3x+23\]. Apply the distributive law to get, \[7x+13=4x-10+3x+23\] This gives, \[7x+13=7x+13\] This is true for every real\[x\]. Thus, the given equation is identity whose solution set is \[\left\{ x:x\text{ is a real number} \right\}\]. The required solution is\[\left\{ x:x\text{ is a real number} \right\}\].
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