\documentclass[12pt]{article} \pagestyle{empty} \begin{document} \begin{displaymath} \rho_i \times T_{i \rightarrow j} \times A_{i \rightarrow j} = \rho_j \times T_{j \rightarrow i} \times A_{j \rightarrow i} \end{displaymath} \end{document}
\documentclass[12pt]{article} \pagestyle{empty} \begin{document} \begin{displaymath} \rho_i \times T_{i \rightarrow j} \times A_{i \rightarrow j} = \rho_j \times T_{j \rightarrow i} \times A_{j \rightarrow i} \end{displaymath} \end{document}