Left-aligned text on same line as numbered equation

Question

I currently have this:

With the following code and preamble:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$\backslash c_{t}$ \begin{equation}
{C_{t}: \pi D_{1}U(c_{t},L_{t})+\pi(-1)p_{t}=0 \iff D_{1}U(c_{t},L_{t})-p_{t}=0}
\end{equation}

\end{document}

I want to have the "\c_t" on the same line, left-aligned.

I have tried my best to Google around but nothing seems to be right. One person suggested I put it in a table, but that seems cumbersome, especially to do this numerous times.

Answer 1

I don't see the point of \backslash c_{t} here ( a special notation?) but I would use an alignat environment and either \text{\textbackslash} ...} or \backslash... if this is needed.

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc} 
\usepackage{graphicx}
\usepackage{setspace}
\usepackage{fullpage}
\usepackage{amsmath,amsfonts,amssymb}
\usepackage[backend=bibtex,style=authoryear-ibid]{biblatex}
\addbibresource{bibston.bib}
\usepackage{url}
\usepackage{textcomp}
\usepackage{breqn}
\usepackage{indentfirst}

\begin{document}

\begin{alignat}{3}
\text{\textbackslash} c_{t} &\quad &{}C_{t}: \pi D_{1}U(c_{t},L_{t})+\pi(-1)p_{t} &{}=0 \iff D_{1}U(c_{t},L_{t})-p_{t}&{}=0 \label{foo} \\
\backslash c_{t} &\quad &{}C_{t}: \pi D_{1}U(c_{t},L_{t})+\pi(-1)p_{t} &{}=0 \iff D_{1}U(c_{t},L_{t})-p_{t}&{}=0 \label{fooother} 
\end{alignat}

In \eqref{foo} we see

\end{document}