Answer
$\log_{7} y+3\log_{7} z-\log_{7} x$
Work Step by Step
$\log_{7} \frac{yz^{3}}{x}$
=$\log_{7} (yz^{3})-\log_{7} x$
=$\log_{7} y+\log_{7} z^{3}-\log_{7} x$
=$\log_{7} y+3\log_{7} z-\log_{7} x$
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