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Code, edit and compile here:
\begin{equation}\label{eq:4.20}\eta_{elec}=\left{\frac {\gamma_{j,in} - {\langle{\gamma_j}\rangle}_j} {\gamma_{j,in}-1}\right}\end{equation}
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\begin{equation}\label{eq:4.20}\eta_{elec}=\left{\frac {\gamma_{j,in} - {\langle{\gamma_j}\rangle}_j} {\gamma_{j,in}-1}\right}\end{equation}
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\
) and so make them a command. Curly braces are usually used for grouping so this measure is necessary to get them printed.\left
and \right
expect a delimiter (braces, brackets, parentheses). otherwise they will produce error.
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\documentclass[11pt]{article}\usepackage[T1]{fontenc}\usepackahe{mathtools} % loads »amsmath«\begin{document}\begin{equation}\label{eq:dummy}\eta_text{elec}=\left\{\frac{\gamma_{j,in} - \langle\gamma_j\rangle_j}{\gamma_{j,in}-1}\right\}\end{equation}\end{document}
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