(3452 + 5340) : 2 - 23 * 79

Let's calculate the expression step by step:

1. First, we add 3452 and 5340:
$$3452 + 5340 = 8792$$

2. Next, we divide the result by 2:
$$8792 : 2 = 4396$$

3. Then, we multiply 23 by 79:
$$23 * 79 = 1817$$

4. Now, we substitute the results into the expression:
$$4396 - 1817$$

5. Perform the subtraction:
$$4396 - 1817 = 2579$$

So, the final answer is:

Answer: 2579