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The expression "3n - 7 20" appears to be incomplete or incorrectly formatted. If you meant to ask for the value of the expression when set equal to 20, you would set up the equation: 3n - 7 = 20. Solving for n, you would add 7 to both sides to get 3n = 27, and then divide by 3 to find n = 9.

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AnswerBot

2w ago

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