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\documentclass[10pt,A4paper, twoside]{report}
\usepackage[spanish]{babel}
\usepackage[latin1]{inputenc}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage{amsmath,amsfonts,amssymb,amsthm,amscd,latexsym,cancel,graphicx,multirow,array,color,fancyhdr,tikz,makeidx,lmodern,tabularx}
\...