20 + (12 - 8) / (2(12) - 8 - 7) * 10

First, perform the multiplication:

$$2(12) = 24$$

Then, perform the subtractions from left to right:

$$24 - 8 - 7 = 16 - 7 = 9$$

To add 20 and $\frac{40}{9}$, find a common denominator.

$$20 = \frac{20 \times 9}{9} = \frac{180}{9}$$

Now add the fractions:

$$\frac{180}{9} + \frac{40}{9} = \frac{180 + 40}{9} = \frac{220}{9}$$

The final answer is $\boxed{\frac{220}{9}}$.