The Sound Source has a going-out-of-business sale. Amy, Bill, and Carlton each purchase some CDs, some DVD movies, and some cassette tapes. Amy buys 6 CDs, 2 DVD movies, and 4 cassette tapes for a total cost of $40. Bill buys 3 CDs, 6 DVD movies, and 1 cassette tape for a total cost of $53. Carlton buys 6 CDs, 7 DVD movies, and 3 cassette tapes for a total cost of $73. From the information given, can you find the cost of each item? Why?
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