using System;

public class Program

{

    public static void Main()

    {

        double sol_eq_1, sol_eq_2, paso = 1;

​

            for (double x = -100; x < 100; x = x + paso)

            {

                for (double y = -100; y < 100; y = y + paso)

                {

                    if (1 == 3 * x + y & 4 == 7 * x + 2 * y)

                    {

                        Console.WriteLine("La solución es x=" + x + " y=" + y);

                        break;

                    }

                }

            }

​

            Console.ReadLine();

​

    }

}