Answer
$\log_a \dfrac {m}{nt}$
Work Step by Step
$\log _{a}m-\log _{a}n-\log _{a}t=\left( \log _{a}m-\log _{a}n\right) -\log _{a}t=\log_a \dfrac {m}{n}-\log _{a}t=\log_a \dfrac {m}{nt}$
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