-7•(8а-9)+(-7а+n)

To simplify the expression \(-7 \cdot (8a - 9) + (-7a + n)\), we can follow these steps:

1. Distribute \(-7\) into the first term: \[ -7 \cdot (8a - 9) = -56a + 63 \]

2. Now, rewrite the expression with the distributed values: \[ -56a + 63 + (-7a + n) \]

3. Combine like terms. We have two terms involving \(a\) and constant terms: \[ -56a - 7a + 63 + n = -63a + 63 + n \]

So, the simplified expression is: \[ -63a + 63 + n \]