Answer
For the first, no value of x works; for the second, all values for x work.
Work Step by Step
The first:
$x+7=x+6$
$0=1$
This is false.
The second:
$x+7=x+7$
$0=0$
This is always true; thus any value for x works.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 2 - Section 2.1 - Linear Equations in One Variable - Exercise Set - Page 56: 83
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