1. **State the problem:** Simplify the expression $-5 - 15 + 4 + 15$.
2. **Combine like terms:** Group the negative and positive numbers separately.
$$(-5 - 15) + (4 + 15)$$
3. **Calculate each group:**
$$-5 - 15 = -20$$
$$4 + 15 = 19$$
4. **Add the results:**
$$-20 + 19 = -1$$
5. **Final answer:** The simplified value of the expression is $-1$.
Simplify Expression Cbd541
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