simult 3x3, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            double a1,a2,a3,a4,b1,b2,b3,b4,c1,c2,c3,c4,d1,d2,d3,d4,e1,e2,e3,e4;
            double w,x,y,z;
            int count = 0;
            int limit = 50;
            
                a1 = 7 ;b1 = 2;  c1 = -1; d1 = -4; e1 = -9;
                a2 = 5; b2 = 8; c2 = -2; d2 = -1; e2 = 2;
                a3 = -4; b3 = 2; c3 = 2; d3 = 2; e3 = 8;
                a4 = 9; b4 = 6; c4 = 3; d4 = 9; e4 = 6;
                /*/
                a1 = 2 ;b1 = -1;  c1 = 5; d1 = 1; e1 = -3;
                a2 = 3; b2 = 2; c2 = 2; d2 = -6; e2 = -32;
                a3 = 1; b3 = 3; c3 = 3; d3 = -1; e3 = -47;
                a4 = 5; b4 = -2; c4 = -3; d4 = 3; e4 = 20;
                //
                a1 = 3; b1 = 8; c1 = 9; d1 = 2; e1 = 1;
                a2 = 5; b2 = 2; c2 = 7; d2 = 3; e2 = 2;
                a3 = 6; b3 = 4; c3 = 3; d3 = 6; e3 = 1;
                a4 = 2; b4 = 2; c4 = 5; d4 = 6; e4 = 3;
                */
                x = (( ( (d4*c3-d3*c4)*(d3*b2-d2*b3)-(d3*c2-d2*c3)*(d4*b3-d3*b4) ) * ( (d3*c2-d2*c3)*(d2*e1-d1*e2)-(d2*c1-d1*c2)*(d3*e2-d2*e3) )  )-( (d3*c2-d2*c3)*(d2*b1-d1*b2)-(d2*c1-d1*c2)*(d3*b2-d2*b3) ) * ( (d4*c3-d3*c4)*(d3*e2-d2*e3)-(d3*c2-d2*c3)*(d4*e3-d3*e4) ))
                     /
                    ( ( (d4*c3-d3*c4)*(d3*b2-d2*b3)-(d3*c2-d2*c3)*(d4*b3-d3*b4) ) * ( (d3*c2-d2*c3)*(d2*a1-d1*a2)-(d2*c1-d1*c2)*(d3*a2-d2*a3) ) - ( (d3*c2-d2*c3)*(d2*b1-d1*b2)-(d2*c1-d1*c2)*(d3*b2-d2*b3) )* ( (d4*c3-d3*c4)*(d3*a2-d2*a3)-(d3*c2-d2*c3)*(d4*a3-d3*a4) ) );

y = ( (d3*c2-d2*c3)*(d2*e1-d1*e2) - (d2*c1-d1*c2)*(d3*e2-d2*e3) - ( (d3*c2-d2*c3)*(d2*a1-d1*a2) - (d2*c1-d1*c2)*(d3*a2-d2*a3) )*x ) 
                / ( (d3*c2-d2*c3)*(d2*b1-d1*b2) - (d2*c1-d1*c2)*(d3*b2-d2*b3) );

//z = (d3*e2-d2*e3-(d3*a2-d2*a3)*x-(d3*b2-d2*b3)*y ) / (d3*c2-d2*c3);
                //z = ((d4*e3-d3*e4)-(d4*a3-d3*a4)*x-(d4*b3-d3*b4)*y) / (d4*c3-d3*c4);
                //z = ((d2*e1-d1*e2)-(d2*a1-d1*a2)*x-(d2*b1-d1*b2)*y);// (d2*c1-d1*c2);
            
                z = ((d2*e1-d1*e2));
                double z2 = (d2*a1-d1*a2)*x;
                double z3 = (d2*b1-d1*b2)*y;
                double z4 = (d2*c1-d1*c2);
                w = (e1-a1*x-b1*y-c1*z) / d1;
            Console.WriteLine("{0} {1} {2} {3}", z, z2, z3, z4);
//                Console.WriteLine("x, y, z, w = {0}, {1}, {2}, {3}", x,y,z,w);
            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,11 sec, average memory usage: 14 Mb, average nr of threads: 3