Give the step-by-step reasoning process and then the final answer. Ben's new car cost twice as much as his old car. He sold his old car for $1800 and used that to pay off some of the cost of his new car. He still owes another $2000 on his new car. How much did his old car cost, in dollars?
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His new car costs 1800 + 2000 = 3800 dollars. His old car cost 3800 / 2 = 1900 dollars.
The final answer: 1900.
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