#### Answer

Choice C

#### Work Step by Step

To solve $
3x-1=7
,$ add $1$ first to both sides to give
\begin{array}{l}\require{cancel}
3x-1+1=7+1
\\\\
3x=7+1
.\end{array}
Hence, $\text{
Choice C
.}$

Published by
Pearson

ISBN 10:
0-32184-874-8

ISBN 13:
978-0-32184-874-1

Choice C

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