$$8 a - 10 a + 5 a + 10 b + 3 a + 17 b$$
$6a+27b$
$$-2a+5a+10b+3a+17b$$
$$3a+10b+3a+17b$$
$$6a+10b+17b$$
$$6a+27b$$
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$3\left(2a+9b\right)$
$$3\left(2a+9b\right)$$