Two people are working together to write thank-you notes for donations to a charity. There were 980 donations. One of them can write 5 notes per hour, and works 10 hour days, while the other can write 6 notes per hour, but works 8 hour days.
How many days will it be before all the thank-you notes are written?
Your answer should involve using equation(s) that represent the number of notes written (y) after any number of days (x)
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