The expression given is:

$8 - (4 - 2) - (7 - 9) \times 9$

Let's break it down step by step:

1. First, solve the operations inside the parentheses:

   • $(4 - 2) = 2$
   • $(7 - 9) = -2$

2. Substitute these values back into the expression:

$8 - 2 - (-2) \times 9$

3. Next, perform the multiplication:

$(-2) \times 9 = -18$

Now the expression is:

$8 - 2 - (-18)$

4. Simplify by dealing with the subtraction:

$8 - 2 + 18$

5. Finally, add and subtract the values:

$6 + 18 = 24$

So, the value of the expression is 24.

Would you like further details or have any questions?

Here are 8 related questions for practice:

1. Simplify the expression: $10 - (3 + 4) + 2 \times 5$.
2. Evaluate $15 - (6 - 2 \times 3) + 4$.
3. Simplify $(12 - 4) \times (7 - 3)$.
4. Solve $9 - 3 \times (5 + 2)$.
5. Simplify $20 - (8 - 3) \times 2 + 4$.
6. Evaluate $14 - 2 \times (5 + 3)$.
7. Simplify $10 - (6 + 4) \times 2$.
8. Solve $18 - 3 \times (4 - 1) + 5$.

Tip: Always solve operations inside parentheses first, then proceed with multiplication/division before addition/subtraction.