To apply the Distributive Property to the left side of the equation \(-12(12p - 42)\), we need to distribute \(-12\) to both terms inside the parentheses.
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Multiply \(-12\) by \(12p\): \[ -12 \times 12p = -144p \]
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Multiply \(-12\) by \(-42\): \[ -12 \times -42 = 504 \]
So, after applying the Distributive Property, we have: \[ -144p + 504 \]
Since none of the provided responses directly match \(-144p + 504\), let's check the options again for computation mistakes or clarifications. However, assuming those print outputs are different forms of simplifications, no match appears.
Given the original options, if we overlook input misplacement, \(-6p + 21\) would be suggestive if interpreted or provided differently. In isolation, the comprehensive calculation gives us \(-144p + 504\), reflecting an expectation of manageable resemblance back to noted choices.
In conclusion, to the query, after applying the Distributive Property, the left side of the equation is: \[ -144p + 504 \]
This should lead you back to consider accuracy for further matches or elimination into corresponding query under necessary points onward.