Gauss-Jordan Equation Method in C++

Write a C++ program that can solve system of linear equations with Gauss-Jordan Method. There should be a system of linear equations in the input file "gauss.dat" in the form of matrices.

For example: the system of linear equations:
3x+5y+2z=1
3x+2y+7z=1
3x+6y+8z=1

In the input file:
3 <------ is the dimension of the matrix
1   3   5 2
1   3   2 7   
1   3   6 8

You should get the matrices from the input file. Then solve the answer with Gauss-Jordan method.
The equations and the answers need to be put in the output file "gauss.txt".

#include <iostream>
#include <cmath>
#include <cstdlib>
#include <sstream>
#include <fstream>
#include <string>


using namespace std;

void freeArray(int N, double **M){
    // De-Allocate memory to prevent memory leak
    for (int i = 0; i < N; i++)
       delete [] M[i];
    delete [] M;
}


double **AllocateArray(int N){
    double **M;
    M = new double*[N];
    for (int i = 0; i < N; i++)
       M[i] = new double[N+1];

    return M;

}

// read of set of equations
int readOneSetOfEquations(int *Num, double ***M,istream &inFile, int toScreen){
    char line[256];
    int value;
    string s;
    stringstream ss;
    // read dimension
    *Num=0;
    if(!inFile.eof()){
       if ( toScreen ==1){
            // from kdb
            do{
                cout << "Enter Number of rows ( from 2 to 9):";
                cin>> value;
                cin.clear();
                cin.ignore(INT_MAX,'\n');
                if(value <2 || value >9)
                   cout << "Error! Value must be in [2,9]"<< endl;
                else
                   break;...

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