Question:
If $r$, $s$, and $t$ are constants such that $\frac{x^{r-2}\cdot y^{2s}\cdot z^{3t+1}}{x^{2r}\cdot y^{s-4}\cdot z^{2t-3}}=xyz$ for all non-zero $x$, $y$, and $z$, then solve for $r^s\cdot t$. Express your answer as a fraction.

Answer:
First, we should solve for $r$, $s$, and $t$.  From what is given, we know that $\frac{x^{r-2}}{x^{2r}}=x$, $\frac{y^{2s}}{y^{s-4}}=y$, and $\frac{z^{3t+1}}{z^{2t-3}}=z$. Solving for r, s, and t we have: \begin{align*}
r-2=2r+1\Rightarrow r=-3\\
2s=s-4+1\Rightarrow s=-3\\
3t+1=2t-3+1\Rightarrow t=-3\\
\end{align*}Solving for $r^s\cdot t$, we have $(-3)^{-3}\cdot {-3}=\frac{-1}{27}\cdot {-3}=\boxed{\frac{1}{9}}$.