LaTeX.org

By using flalign and one & at the start of the line and another & at its end.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\section*{}
Some text.
\begin{flalign*}
&T_{total} = T_{eye} + T_{sm} + T_{SRT} + 4 \times T_{each tile}+ 4 \times 4 \times T_{each tile}&\\
&T_{each tile ...