documentclass[10pt, a4paper]{article}
usepackage[utf8]{inputenc}
usepackage[T2A]{fontenc}
usepackage[english, russian]{babel}
usepackage{Lections_style}

RequirePackage{amsfonts}
  RequirePackage{amsmath}
  RequirePackage{amssymb}
  RequirePackage{graphicx}
  RequirePackage{babel,blindtext}
  RequirePackage{subfigure}
  RequirePackage{hyperref}
  RequirePackage{fancyhdr}
  RequirePackage{cite}
  RequirePackage{amsthm}
  RequirePackage{xparse}
  RequirePackage{mathabx}
  RequirePackage{array}
  RequirePackage{tabularx}
  RequirePackage{multirow}
  RequirePackage{makecell}