Answer
$3\log x+4\log y-6\log z$
Work Step by Step
$\log(\frac{x^{3}y^{4}}{z^{6}})=\log(x^{3}y^{4})-\log z^{6}=\log x^3+\log y^4-\log z^6=3\log x+4\log y-6\log z$
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