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\documentclass[12pt,a4paper]{article}
\usepackage{amsmath,amssymb,amsfonts}
\begin{document}
\[
\begin{aligned}
-5 + 3x + 2(5x - 3)&\\ \text{Distribute the $2$ to the $5x$ and the $3$}
&= -5 + 3x + 2(5x) - 2(3)\\ \text{Multiply $2(5x)$ and $-2(3)$}
&= -5 + 3x + 10x - 6\\ \text{Combine like terms}
&= -11 + 13x\\
&= 13x - 11\\
\end{aligned}
\]
\end{document}
Thanks
Nick