Answer by Leucippus for Vertical alignment with cases environment

This is one way to obtain the same formula structure and have the equal signs line up.

\documentclass{scrartcl}\usepackage{amsmath}\begin{document}\begin{align*}& a+b =0 \text{ some text a } \\& c+d =0 \text{ some text b } \\& \hspace{1.5mm} \left. \begin{array}{l} \lambda_{a} = x \\  \lambda_{b} = y \end{array} \right\} \quad \text{ some text c } \end{align*}\end{document}