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3x - 7 ≤ 9

"Seven less than" means that you subtract seven from the answer.

"Three times a number" means that you multiply it.

"At most" means that this is the greatest number that it can be, which is, in this case, 9.

To solve this, you apply the principle rules of algebra to determine x.

3x ≤ 9 + 7

3x ≤ 16

x ≤ 16/3

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Q: How do you solve seven less than three times a number is a most 9?
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