1. **State the problem:** Simplify the expression $-10 - (-(-(3+x)))$.
2. **Understand the signs:** The expression has nested negatives. Recall that $-(-a) = a$.
3. **Simplify the innermost parentheses:**
$$-(-(3+x)) = 3+x$$
4. **Substitute back:**
$$-10 - (3+x)$$
5. **Remove parentheses by distributing the minus sign:**
$$-10 - 3 - x$$
6. **Combine like terms:**
$$-13 - x$$
**Final answer:**
$$-13 - x$$
Simplify Expression 5630Ce
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