using System;

public class Program

{//autora Camacho Sánchez Teresita de Jesús PRP 301 14-03-22

    public static void Main()

    {//declarar variables 

        int num =1,n = 2;

        while (n<21)

        {

        Console.WriteLine("2x"+ num+"="+n);

        num=num+1;

            n=n+2;

        }

    }

}