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\begin{align}
E_g(T=300\,\text {K})&=(1.442\pm 0.002)\,\text {eV}\\
E_g(T=300\,\text {K})&=(1.511\pm 0.002)\,\text {eV}
\end{align}

\begin{equation}\label{xx} 
\begin{split} 
a& =b+c-d\\ 
& \quad +e-f\\ 
& =g+h\\ 
& =i 
\end{split} 
\end{equation}