#### Answer

8x - 9

#### Work Step by Step

To find the total length of the board, we add the length of each part. The expression is written as:
x + (7x - 9)
Add and simplify to get 8x - 9.

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

8x - 9

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