#### Answer

$6x+12$

#### Work Step by Step

By combining like terms, the given expression, $
(3x+5)+(3x+7)
$, is equivalent to
\begin{array}{l}\require{cancel}
(3x+3x)+(5+7)
\\\\=
6x+12
.\end{array}

Published by
Pearson

ISBN 10:
0321785045

ISBN 13:
978-0-32178-504-6

$6x+12$

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