\documentclass[12pt]{extbook} \usepackage{amsmath,amssymb,amsfonts,latexsym,cancel} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage{multicol} %---- \usepackage{graphicx} \usepackage{overpic} \usepackage{booktabs} \usepackage{longtable} \usepackage{array} \usepackage{multirow} \usepackage{wrapfig} \usepackage{float} \usepackage{colortbl} \usepackage{pdflscape} \usepackage{tabu} \usepackage{threeparttablex} \usepackage[normalem]{ulem} \usepackage{makecell} \usepackage[usenames,dvipsnames]{xcolor}