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The answer is 5.

Explanation:

[tex]\frac{x-6}{3}[/tex]

We want to know the value when x = 21. Therefore, substitute x = 21 in the expression.

[tex]\frac{21-6}{3}[/tex]

Evaluate 21-6 = 15

[tex]\frac{15}{3}[/tex]

Therefore, the answer is 5.

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