Karsted Air Services is now in the final year of a project. The equipment originally cost $21 million, of which 100% has been depreciated. Karsted can sell the used equipment today for $7 million, and its tax rate is 25%. What is the equipment's after-tax salvage value? Write out your answer completely. For example, 13 million should be entered as 13,000,000. Round your answer to the nearest dollar.