Create Formula - Add # of Networkdays to a specific start date to find an end date

[bdicarlo1]

I need to create a formula where I add a set number of Networkdays to a
start date. Example:

Start Date = 1/2/07
Number of Networkdays = 21
End Date = Is calculated

If Start = 1/2/07 and 21 Networkdays are added, what is the retured end
date????

I can only find example of Networkdays where I would be providing the
Start and End Dates, and it will calculate the Networkdays. I can't
find example where End Date is calculated based on the number of
networkdays from start date.

Can anyone help with a valid formula for this?

Thanks!!