import java.io.*;

public class GaussJordan {
   double[][] coefficients;
   int rows;
   int columns;

   public GaussJordan(int rows) throws IOException {
      InputStreamReader stream = new InputStreamReader(System.in);
      BufferedReader keyboard = new BufferedReader(stream);

      this.rows = rows;
      columns = rows+1;

      coefficients = new double[rows][columns];

      for (int counter=0;counter < rows;counter++)
         for (int counter1=0;counter1 < columns;counter1++) {
            System.out.println("Please enter coefficients[" + counter + "][" + counter1 + "]");
            coefficients[counter][counter1] = new Double(keyboard.readLine()).doubleValue();
         }
   }

   public void display_contents() {
      String line="";

      for (int counter=0;counter < rows;counter++) {
         line = String.valueOf(coefficients[counter][0]);
         for (int counter1=1;counter1 < columns;counter1++)
            line += "\t" + String.valueOf(coefficients[counter][counter1]);
         System.out.println(line);
      }
   }

   public void elimination() {
      for (int rowcounter=0;rowcounter <rows;rowcounter++) {
         double temp = coefficients[rowcounter][rowcounter];
         for (int columncounter=0;columncounter < columns;columncounter++)
            coefficients[rowcounter][columncounter] /= temp;

         for (int counter=rowcounter+1;counter < rows;counter++) {
            temp = coefficients[counter][rowcounter];
            for (int columncounter=0;columncounter < columns;columncounter++)
               coefficients[counter][columncounter] += -1*temp*coefficients[rowcounter][columncounter];
         }
      }

      for (int rowcounter=rows-1;rowcounter > =0;rowcounter--)
         for (int counter=rowcounter-1;counter > =0;counter--) {
            double temp = coefficients[counter][rowcounter];
            for (int columncounter=0;columncounter < columns;columncounter++)
               coefficients[counter][columncounter] += -1*temp*coefficients[rowcounter][columncounter];
         }
   }

   public static void main(String[] args) throws IOException {
      GaussJordan myGaussJordan = new GaussJordan(3);

      myGaussJordan.elimination();

      myGaussJordan.display_contents();
   }
}