Math- MDM4U data Managment

How do you solve this question. I literally have no idea on where to start. "If the mean of the following numbers is /7, find the c value. Produce an algebraic solution.
Numbers: 12, 18, 21, c, 13

Please help.

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  1. Sorry. There's no / before 7. A typo. It's actually 17

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  2. (12 + 18 + 21 + c + 13) / 5 = 17

    64 + c = 85

    c = 21

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