#### Answer

$=x+2y$

#### Work Step by Step

$d=a_{n+1}-a_{n}=\left( 3x+7y\right) -\left( 2x+5y\right) =\left( 2x+5y\right) -\left( x+3y\right) =x+2y$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$=x+2y$

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