Fill in the Blank

A facility operations manager in Denver is analyzing temperature fluctuations to ensure building efficiency. The log shows a lunchtime temperature of −6-6 degrees that dropped to −15-15 degrees by sunset. To find the difference, the manager uses the expression −6−(−15)-6 - (-15). According to the subtraction strategy, this expression is simplified by replacing the subtraction of a negative with the addition of a positive: −6+-6 + ____.

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Updated 2026-09-19

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