Diophantus' youth lasted 1/6 of his life. He grew a beard after 1/12 more. After 1/7 more of his life, he married. Five years later, he and his wife had a son. The son lived exactly half as long as his father, and Diophantus died 4 years after his son. How old was Diophantus when he died?
Answer:
84........... x/6 + x/12 + x/7 + 5 + x/2 + 4 = x
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