To solve the equation \( 12k = 42.3 \), the appropriate procedure is to divide both sides by 12.
Here's the step-by-step solution:
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Start with the equation: \[ 12k = 42.3 \]
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Divide both sides by 12: \[ k = \frac{42.3}{12} \]
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Calculate \( \frac{42.3}{12} \): \[ k = 3.525 \]
Therefore, the correct response is: Divide both sides by 12; the solution is 3.525.