Answer
-1
Work Step by Step
$\frac{7-b}{b-7}=\frac{7-b}{-(7-b)}=\frac{1}{-1}\times\frac{7-b}{7-b}=-1\times1=-1$
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter 6 - Section 6.1 - Rational Expressions and Functions; Multiplying and Dividing - 6.1 Exercises - Page 375: 53
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