Often the broker's software will help make this adjustment, but yes you should keep track of the wash sales and you correctly stated how to calculate the adjustment.
To make this adjustment in the turboTax software you would enter the transaction exactly as it show on the 1099-B. After entering the data there is a bar at the bottom of the screen that says "I'll enter additional info on my own." Toward the bottom there is an option to "Correct The Cost Basis". You can make the adjustment here.
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