-0.25(84 - 32n) - n

To simplify the expression -0.25(84 - 32n) - n, we will follow the order of operations, also known as PEMDAS:

1. Start by distributing -0.25 to the terms inside the parentheses:
-0.25 * 84 = -21
-0.25 * (-32n) = 8n
So, the expression becomes: -21 + 8n - n.

2. Combine like terms:
In this case, we have 8n - n, which simplifies to 7n.
Therefore, the simplified expression is -21 + 7n.