#### Answer

The number is $= -5$

#### Work Step by Step

Let $x = $ be the unknown number
$2x + x = -15$
$3x = -15$
$x = \frac{-15}{3}$
$x = -5$

Published by
Pearson

ISBN 10:
0321825535

ISBN 13:
978-0-32182-553-7

The number is $= -5$

Let $x = $ be the unknown number
$2x + x = -15$
$3x = -15$
$x = \frac{-15}{3}$
$x = -5$

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.