using System;

​

namespace ax_sym_con

{

    public class Program

    {

        public static void Main(string[] args)

        {

            double xm, ym, A, B, C, A1, B1, C1, kp, k, b, x, y, xn, yn;

​

            Console.WriteLine("Enter coordinates for point M");

            Console.WriteLine("======================");

            Console.Write("xm = "); xm = double.Parse(Console.ReadLine());

            Console.Write("ym = "); ym = double.Parse(Console.ReadLine());

            Console.WriteLine("Enter coefficients for g1");

            Console.WriteLine("======================");

            Console.Write("A = "); A = double.Parse(Console.ReadLine());

            Console.Write("B = "); B = double.Parse(Console.ReadLine());

            Console.Write("C = "); C = double.Parse(Console.ReadLine());

​

            kp = -A / B;

            k = -1 / kp;

            b = (ym - k * xm);

            A1 = -k;

            B1 = 1;

            C1 = -b;

​

            x = (C1 * B - C * B1) / (A * B1 - A1 * B);

            y = (-A * x - C) / B;

            Console.WriteLine("Coordinates for point N");

            Console.WriteLine("======================");

            xn = 2 * x - xm;

            Console.WriteLine("xn = " + xn);

            yn = 2 * y - ym;

            Console.WriteLine("yn = " + yn);

            Console.WriteLine("======================");

        }

    }

}

​