Answer
$x=24$
Work Step by Step
"Sum" indicates addition.
$7+9+x=40$ $\longrightarrow$combine like terms
$16+x=40$ $\longrightarrow$addition property
$16+x-16=40-16$ $\longrightarrow$combine like terms
$x=24$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 3 - Section 3.4 - Linear Equations in One Variable and Problem Solving - Exercise Set - Page 195: 14
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