Answer
The number is $= -5$
Work Step by Step
Let $x = $ be the unknown number
$2x + x = -15$
$3x = -15$
$x = \frac{-15}{3}$
$x = -5$
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - 9.8 Using Equations to Solve Application Problems - 9.8 Exercises - Page 687: 27
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