#### 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
$x=24$

Published by
Pearson

ISBN 10:
0321955048

ISBN 13:
978-0-32195-504-3

$x=24$

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