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+%tomado y transformado de: https://www.overleaf.com/latex/templates/assignment-homework-solutions-template/nfjybpqbdrrn
+%%%%%%
+%% No edites esta parte
+%%%%%%
+\documentclass[11pt]{article}
+\usepackage[papersize={10in,6.5in},margin=0.5in]{geometry}
+\usepackage[utf8]{inputenc}
+\usepackage[spanish]{babel}
+
+%%%%%%
+%% Opciones
+%%%%%%
+
+\usepackage[fleqn]{amsmath}
+\usepackage{amssymb,amsthm}  % assumes amsmath package installed
+
+\usepackage{xcolor}
+\usepackage{mdframed}
+
+\newenvironment{problem}[2][Problem]
+    { \begin{mdframed}[backgroundcolor=gray!20] \textbf{#1 #2} \\}
+    {  \end{mdframed}}
+
+% Define solution environment
+\newenvironment{solution}
+    {\textit{Solution:}}
+    {}
+
+\renewcommand{\qed}{\quad\qedsymbol}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{document}
+
+%%%%%%%%%%%%%%
+%% Datos de la tarea: mantener formato
+%%%%%%%%%%%%%%
+\noindent
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\large\textbf{Nombre} \hfill \textbf{Tarea - \#}   \\
+Mattermost @nombre \hfill ID: 123456789 \\
+\normalsize Curso: M* - TemaTema \& Teoría de Campos \hfill LA-CoNGA 2021\\
+Responsable: XX. XXXXX \hfill Fecha: \today \\
+\noindent\rule{\textwidth}{2.8pt}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Problema 1
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{problem}{1}
+Considere la acción del Campo de Klein-Gordon
+\begin{equation}\label{accion.campo.escalar.real}
+\mathcal{S}=\int {\rm d}^4 x \mathcal{L}=\frac{1}{2}\int {\rm d}^4 x \left(\partial_{\mu}\phi\partial^{\mu}\phi - m^2\phi^2\right).
+\end{equation}
+Halle las ecuaciones de movimiento ...
+\end{problem}
+\begin{solution}
+Las ecuaciones de movimiento se derivan del principio variacional, bla, bla ... acción definida en \ref{accion.campo.escalar.real} ... definimos $\Box \equiv \partial_{\mu}\partial^{\mu}$ ... expresión \ref{ecuacion.KG}:
+\begin{equation}\label{ecuacion.KG}
+\left(\Box + m^2\right)\phi=0.
+\end{equation}
+\end{solution} 
+\noindent\rule{\textwidth}{2.8pt}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Problem 2
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\begin{problem}{1}
+Considere la acción del Campo de Klein-Gordon
+\begin{equation}\label{accion.campo.escalar.complejo}
+\mathcal{S}=\int {\rm d}^4 x \mathcal{L}=\int {\rm d}^4 x \left(\partial_{\mu}\phi\partial^{\mu}\phi^{*} - m^2\phi\phi^{*}\right).
+\end{equation}
+Halle las ecuaciones de movimiento ...
+\end{problem}
+\begin{solution}
+Las ecuaciones de movimiento se derivan del principio variacional, bla, bla ... acción definida en \ref{accion.campo.escalar.complejo} ... definimos $\Box \equiv \partial_{\mu}\partial^{\mu}$ ... expresión \ref{ecuacion.KG.2}:
+\begin{equation}\label{ecuacion.KG.2}
+\left(\Box + m^2\right)\phi=0.
+\end{equation}
+\end{solution} 
+\noindent\rule{\textwidth}{2.8pt}
+\end{document}
+