Question:
Given that $x$ is an integer such that $x\sqrt{x}-5x-9\sqrt{x}=35$, find $x$.

Answer:
We let $\sqrt{x}=y$. Then we have  \begin{align*}
xy-5x-9y&=35\quad\Rightarrow\\
xy-5x-9y+45&=35+45\quad\Rightarrow\\
x(y-5)-9(y-5)&=80\quad\Rightarrow\\
(x-9)(y-5)&=80.
\end{align*} We know $y=\sqrt{x}$, so we resubstitute to find $(x-9)(\sqrt{x}-5)=80$. We construct a table of all factor pairs which multiply to $80$, and proceed to solve for $x$ and $\sqrt{x}$:

\begin{tabular}{c|c|c|c}
$x-9$&$\sqrt{x}-5$&$x$&$\sqrt{x}$\\ \hline
$1$&$80$&$10$&$85$\\
$2$&$40$&$11$&$45$\\
$4$&$20$&$13$&$25$\\
$5$&$16$&$14$&$21$\\
$8$&$10$&$17$&$15$\\
$10$&$8$&$19$&$13$\\
$16$&$5$&$25$&$10$\\
$20$&$4$&$29$&$9$\\
$40$&$2$&$49$&$7$\\
$80$&$1$&$89$&$6$
\end{tabular}

Of all solutions, only one satisfies the relationship $\sqrt{x}^2=x$, and that is $\sqrt{x}=7$ and $x=\boxed{49}$.