Subtract(-7-8)-(-5n+9)

To compute the expression Subtract(-7-8)-(-5n+9), we first need to simplify the terms inside the parentheses:

-7 - 8 = -15

Then, using the property that subtracting a negative is the same as adding a positive, we get:

-(-5n + 9) = 5n - 9

Now, we can subtract -15 from 5n - 9:

5n - 9 - (-15)

Using the same property as before, we can rewrite this expression as:

5n - 9 + 15

Finally, combining like terms, we calculate:

5n + 6

So, Subtract(-7-8)-(-5n+9) simplifies to 5n + 6.