2

I want to get output of the matrix

\begin{pmatrix}
\frac{1}{2} & 0 & \frac{9}{5} \\
-2 & \frac{2}{3} & -\frac{1}{4} \\
12 & 0 & \frac{11}{7} \\
\end{pmatrix}

along with the code displayed side by side using

\begin{example}[side-by-side]
\end{example} 

with cnltx-example package. When I am going to compile (with amsart documentclass) this, it gives an error. How to fix this?

Here is my code

\documentclass{amsart}
\usepackage{amsmath,amsthm,amssymb,amsxtra,amsopn}
\usepackage{cnltx-example}

\begin{document}

\begin{example}[side-by-side]
  Consider the following example.
  \[ (x + y)^2 = x^2 + 2xy + y^2\]
\end{example}

%The following gives an error at the time of compiling
\begin{example}[side-by-side]
  Consider the following matrix.
$\begin{pmatrix}
\frac{1}{2} & 0 & \frac{9}{5} \\
-2 & \frac{2}{3} & -\frac{1}{4} \\
12 & 0 & \frac{11}{7} \\
\end{pmatrix}$
\end{example}

\end{document}
2

Apparently, cnltx-example requires an indentation of the code by two spaces:

\documentclass{amsart}
\usepackage{amssymb}
\usepackage{cnltx-example}

\begin{document}

\begin{example}[side-by-side]
  Consider the following example.
  \[ (x + y)^2 = x^2 + 2xy + y^2\]
\end{example}

%The following gives an error at the time of compiling
\begin{example}[side-by-side]
  Consider the following matrix.
  $\begin{pmatrix} \frac{1}{2} & 0 & \frac{9}{5} \\
  -2 & \frac{2}{3} & -\frac{1}{4} \\
  12 & 0 & \frac{11}{7} \\
  \end{pmatrix}$
\end{example}

\end{document}

enter image description here

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