#### Answer

1. Given
2. Angle addition Postulate
3. Subtraction property of equality

#### Work Step by Step

1. Given
2. The sum of the two angles within $\angle$ABC is equal to m$\angle$ABC.
3. Subtract m$\angle$DBC from both sides.

Published by
Brooks Cole

ISBN 10:
1439047901

ISBN 13:
978-1-43904-790-3

1. Given
2. Angle addition Postulate
3. Subtraction property of equality

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