To make the expression \(54x + 6 + ____ \) equivalent to \(12x + 6\), we need to determine what value needs to be added to \(54x\) in order to get \(12x\).
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Start with the equation: \[ 54x + \text{(unknown value)} = 12x \]
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Rearranging the equation to find the unknown value gives: \[ \text{(unknown value)} = 12x - 54x \] \[ \text{(unknown value)} = -42x \]
Now, we check which of the responses corresponds to \(-42x\):
A. \(-2x\)
B. \(-x\)
C. \(\frac{3}{4}x\)
D. \(-34x\)
None of the options given equal \(-42x\). It looks like there is no correct answer among the responses provided.
However, it seems \(D = -34x\) might have been expected to add to get a common number near -42. Using -34x alongside \(54x\) would yield: \[ 54x - 34x = 20x \] This still isn't correct.
Given none of the answers seem to work, we need an additional operation that equals -42, or review the problem options presented.
Thus, the appropriate additional operation to make \(54x + 6\) equivalent to \(12x + 6\) is to add \(-42x\) which doesn't match any option given.
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