Answer
See the explanation below.
Work Step by Step
An equation can be true for all real numbers if the both sides define the same function is known as identity. For example: $P=Q$; can be re-arranged and simplify when they give the same value.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Section 1.4 - Solving Linear Equations - Exercise Set - Page 52: 82
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