Explanation

To evaluate this expression, we need to follow the order of operations (PEMDAS):

1. Subtract 13 from 4: 4 - 13 = -9

2. Subtract 5 from -9: -9 - 5 = -14

3. Add 8 to -14: -14 + 8 = -6

4. Add 4 to -6 (since -(-4) = 4): -6 + 4 = -2

5. Divide 15 by 3: 15 ÷ 3 = 5

6. Subtract 5 from -2: -2 - 5 = -7

So, the final answer is: -7