#### Answer

$7m$

#### Work Step by Step

If $a$ is a number, then $-(-a)=a$.
Therefore, $-(-7m)=7m$.

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$7m$

If $a$ is a number, then $-(-a)=a$.
Therefore, $-(-7m)=7m$.

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.