Here's a possibility, but clearly not optimal:
Code: Select all
\newcommand\rightalign[1]{\noalign{\vbox{\hfill $\displaystyle #1$}}}
\begin{align*}
A&=B1
\\
&=B2a
\\
\rightalign{B2b}
&=B3
\end{align*}
Code: Select all
\newcommand\rightalign[1]{\noalign{\vbox{\hfill $\displaystyle #1$}}}
\begin{align*}
A&=B1
\\
&=B2a
\\
\rightalign{B2b}
&=B3
\end{align*}
Learn LaTeX easily with newest books:
The LaTeX Beginner's Guide: 2nd edition and perfect for students writing a thesis
The LaTeX Cookbook: 2nd edition full of practical examples for mathematics, physics, chemistry, and more
LaTeX Graphics with TikZ: the first book about TikZ for perfect drawings in your LaTeX thesis