\newcommand{\mlabel}[1]
   {\textcolor{red}{(#1)} \quad}

\newenvironment{mcline}[1]
   {\mlabel{#1} \color{blue} \begin{verb}}  
   {\end{verb} \color{black}}

\newenvironment{mdline}[1]
   {\mlabel{#1} \color{blue} \[}
   {\]}

\newenvironment{maxima}
   {\begin{verb}}
   {\end{verb}}