#### Answer

-20

#### Work Step by Step

To subtract a number, add its opposite number.
$-13-7=-13+(-7)$
To add negative numbers, add their absolute values and make the result negative.
$-13+(-7)=-(|-13|+|-7|)=-(13+7)=-20$

Published by
Prentice Hall

ISBN 10:
0133500403

ISBN 13:
978-0-13350-040-0

-20

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