To solve the equation \( 3(x-2) = 81 \), follow these steps:
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Divide both sides of the equation by 3 to simplify: \[ x - 2 = \frac{81}{3} \] \[ x - 2 = 27 \]
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Next, add 2 to both sides of the equation to solve for \( x \): \[ x = 27 + 2 \] \[ x = 29 \]
The missing value is \( \boxed{29} \).