In LaTeX align text in the center?

5e99ee2f5c3df844903913.png
On one page the text to the left, the second right and so on all pages. And how to make the text was the same in the center?
The template used Book.
% !TeX spellcheck = ru_RU
\documentclass[10pt,a4paper]{book}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage[english, russian]{babel} 
\usepackage{listings}
April 19th 20 at 12:35
0 answer

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