Trading in a car I still owe money on and getting a lease?

A year ago I financed a used 2005 Honda Accord EX V6 that currently has 125,000 miles on it. I still owe 7,000 on the car. The car is starting to have transmission problems. I was on the BMW website and saw some good lease deals. My question is, can i trade in my used car and use that money towards a lease? I know I probably won't get much for this car, assuming they even accept it. What are my options?

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