To add the expressions \( (-4n - 1) + (-9n + 7) \), you can follow these steps:
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Combine like terms:
- Combine the \( n \)-terms: \( -4n + (-9n) = -4n - 9n = -13n \)
- Combine the constant terms: \( -1 + 7 = 6 \)
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Write the combined expression: \[ -13n + 6 \]
So, the sum of the expressions is: \[ -13n + 6 \]