$$7(2a+3b)+(3a+5b)+(5a+6b:$$
$10a+14b$
$$5a+3b+5b+5a+6b$$
$$5a+8b+5a+6b$$
$$10a+8b+6b$$
$$10a+14b$$
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$2\left(5a+7b\right)$
$$2\left(5a+7b\right)$$