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A linear equation is one that may be written in the form

\begin{equation*}
a_1x_1 + a_2x_2 + \ldots + a_nx_n = b\text{.}
\end{equation*}

A linear equation is one that may be written in the form

\begin{equation*}
a_1x_1 + a_2x_2 + \ldots + a_nx_n = b\text{.}
\end{equation*}