Two negative integers are 5 units apart on the number line, and their product is 126. What is the sum of the two integers?

The positive factor pair of 126 that is 5 units apart is 9 and 14, since 9 × 14 = 126 and 14 − 9 = 5. Because both integers are negative, they are −9 and −14; their sum is −23, so the correct choice is –23.

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