1. **State the problem:** Calculate the value of the expression $-45 + (323)$. 2. **Recall the rule:** Adding a positive number is straightforward addition. 3. **Perform the calculation:** $$-45 + 323 = 323 - 45 = 278$$ 4. **Explain:** Since adding a positive number is the same as moving right on the number line, starting at -45 and moving 323 units right lands at 278. **Final answer:** $278$