LaTeX: Align long equations #snippet

gistfile1.txt

\begin{align}
    A &\begin{multlined}[t][.75\textwidth]
    \approx B^{3}C^{-2}\frac{D}{E_{\text{test}}}\arctan(CE)\left( f_{0}(G)+2Bf_{1}(G)\vphantom{\frac{3}{4}}\right.\\
    \left.+\frac{1}{7}B^{2}\left(f_{0}(G)+f_{2}(G)\right) \right)
    \end{multlined}\\
    B &\approx 7A
\end{align}