I have two equations: The first equation needs to be broken up over two lines (e.g., with multline) so that the rest of the equation is right aligned on the second line. I would like to have the second equation aligned with the first equation (i.e., their equal signs are aligned), but I can't seem to figure out how to align it and have the second part of the first equation be right justified.
Example 1:
\documentclass[letterpaper,12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{multline}
\frac{dB}{dt} \approx - 0.092409 \left( 22.2674 e^{-0.092409 t}+77.7326 e^{-0.0258637 t} \right)
\nonumber \\
-\left( 200 \frac{\ln{\frac{1}{2}}}{26.8} \right) \exp{\left(\dfrac{\ln{\frac{1}{2}}}{26.8}t \right)}
\nonumber \\
\approx 2.057708e^{-0.092409 t}+7.18319e^{-0.0258637 t}
\end{multline}
\end{document}
I put everything within multline
environment, but the 2nd equation is not aligned with the first.
Example 2:
\documentclass[letterpaper,12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
\frac{dB}{dt} &\approx - 0.092409 \left( 22.2674 e^{-0.092409 t}+77.7326 e^{-0.0258637 t} \right)
\nonumber \\
-\left( 200 \frac{\ln{\frac{1}{2}}}{26.8} \right) \exp{\left(\dfrac{\ln{\frac{1}{2}}}{26.8}t \right)}
\nonumber \\
&\approx 2.057708e^{-0.092409 t}+7.18319e^{-0.0258637 t}
\end{align}
\end{document}
Here, I've put everything in an aligned environment. The first equation and second equation are aligned, but the second part of the first equation is left aligned/justified. I would like it right justified and the first and third line left justified/aligned.