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Can't figure this math problem out:

Write an algebraic expression for the product of five less than a number and three, less eight, is twenty-eight.

Product is the answer of a multiplication problem.

3(n - 5) - 8 = 28

3n - 15 - 8 = 28

3n = 28 + 23

3n = 51

n = 17

I DON'T KNOW

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