To rewrite the equation \((1/3)^{-4} = 81\) as a logarithmic equation, we first recognize that the equation means:
If we raise \((1/3)\) to the power of \(-4\), we get \(81\).
In logarithmic form, this translates to:
\[ \log_{(1/3)}(81) = -4 \]
So the logarithmic equation is:
\[ \log_{(1/3)}(81) = -4 \]