How can I have linebreaks in my long LaTeX equations?

Question

My equation is very long. How do I get it to continue on the next line rather than go off the page?

Answer 1

This worked for me while using mathtools package.

\documentclass{article}
\usepackage{mathtools}
\begin{document}
    \begin{equation}
        \begin{multlined}
            first term \\
            second term                 
        \end{multlined}
    \end{equation}
\end{document}