Amanda received $50 as a gift. She plans to buy two cassette tapes that cost $9 each and a headphone set that costs $25. How much money will she have left? Think carefully first, then make a decision:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Amanda spent 2 tapes * $9 / tape + $25 = $43. Amanda has $50 - $43 = $7 left. So, the answer is 7.