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By plugging in each number into the inequality, we can determine which number is a solution:
For 6:
3(6) = 18
This equation is not less than or equal to 18, therefore 6 is not a solution.
For 7:
3(7) = 21
This equation is not less than or equal to 18, therefore 7 is not a solution.
For 8:
3(8) = 24
This equation is not less than or equal to 18, therefore 8 is not a solution.
Therefore, none of the numbers 6, 7, and 8 are a solution to the inequality 3x ≤ 18.