 yields$$\documentclass[00pt]{minimal}                 \usepackage{amsmath}                 \usepackage{wasysym}                  \usepackage{amsfonts}                  \usepackage{amssymb}                  \usepackage{amsbsy}                 \usepackage{mathrsfs}                 \usepackage{upgreek}                 \setlength{\oddsidemargin}{-00pt}                 \begin{document}$$ \frac{{{\text{d}}C}}{{{\text{d}}t}} = D_{C} \frac{\alpha B}{0 + \beta R} - D_{A} \pi_{C} (C)C 