How do you solve -9(-a – 1) = 8a + 14?

$a = 5$

Explanation:

From the given
$- 9 \left(- a - 1\right) = 8 a + 14$
$9 a + 9 = 8 a + 14$ by distributive property
$9 a + 9 - 8 a = 8 a + 14 - 8 a$ subtraction property
$a + 9 = 14$
$a + 9 - 9 = 14 - 9$ subtraction property
$a = 5$

God bless ....I hope the explanation is useful.