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-\documentclass{article}
-\newcounter{saveeqn}
-\newcounter{prenum}
-\newcommand{\vareqn}[2]{\setcounter{saveeqn}{\value{equation}}%
- \setcounter{equation}{0}\setcounter{prenum}{#1}
- \renewcommand{\theequation}{\arabic{prenum}[#2{equation}]}}
-\newcommand{\reseteqn}{\setcounter{equation}{\value{saveeqn}}%
- \renewcommand{\theequation}{\arabic{equation}}}
-\begin{document}
-\setcounter{equation}{9}
-\vareqn{33}{\Alph}
-\begin{equation} \frac{a^2 - b^2}{a + b} = a - b \end{equation}
-\begin{equation} \sqrt[3]{-q + \sqrt{q^2 + p^2}} \end{equation}
-\begin{equation} \sqrt[n]{\frac{x^n - y^n}{1 + u^{2n}}} \end{equation}
-\reseteqn
-\begin{equation} 2\sum_{i=1}^n a_i \int^b_a f_i(x) g_i(x)\,dx \end{equation}
-\end{document}