Unit Test Unit Test Active 1 2 3 4 \( \square \) \( \square \) 7 \( \square \) \( \square \) Which expression is equivalent to \( \left(4 x^{3}\right)(2 x)^{-4} \) ? \( \frac{1}{4 x} \) \( \frac{4}{x} \) \( \frac{8}{x} \) \( \frac{128}{x} \)
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