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+```
+% pandoc -f markdown+latex_macros -t markdown
+\newcommand{\my}{\phi}
+$\my+\my$
+^D
+\newcommand{\my}{\phi}
+$\phi+\phi$
+```
+
+```
+% pandoc -f markdown-latex_macros -t markdown
+\newcommand{\my}{\phi}
+$\my+\my$
+^D
+\newcommand{\my}{\phi}
+$\my+\my$
+```
+
+`\let` macros should be expanded at point of
+definition, while `\newcommand` macros should be
+expanded at point of use:
+
+```
+% pandoc -f latex -t latex
+\let\a\b
+\newcommand{\b}{\emph{ouk}}
+\a
+^D
+\b
+```
+
+```
+% pandoc -f latex -t latex
+\newcommand{\a}{\b}
+\newcommand{\b}{\emph{ouk}}
+\a
+^D
+\emph{ouk}
+```
+
+```
+% pandoc -f latex -t latex
+\def\BDpos{}
+\def\BDneg{-}
+\def\beq{\begin{align}}
+\def\eeq{\end{align}}
+\def\e#1{\emph{#1}}
+\def\f#1#2{\emph{#1--#2}}
+
+$5\BDneg 6\BDpos 7$
+
+\beq
+x &= y\\
+\eeq
+
+\e{hi}
+
+\f{hi}{ok}
+^D
+\(5-67\)
+
+\[\begin{aligned}
+x &= y\\\end{aligned}\]
+
+\emph{hi}
+
+\emph{hi--ok}
+```
+
+```
+% pandoc -f markdown+latex_macros -t markdown
+\newcommand{\my}{\phi}
+\begin{equation}
+\my+\my
+\end{equation}
+^D
+\newcommand{\my}{\phi}
+\begin{equation}
+\phi+\phi
+\end{equation}
+```
+
+```
+% pandoc -f markdown-latex_macros -t markdown
+\newcommand{\my}{\phi}
+\begin{equation}
+\my+\my
+\end{equation}
+^D
+\newcommand{\my}{\phi}
+\begin{equation}
+\my+\my
+\end{equation}
+```
+
+```
+% pandoc -f markdown+latex_macros -t markdown
+\newcommand{\my}{\emph{a}}
+\my
+^D
+\newcommand{\my}{\emph{a}}
+\emph{a}
+```