#include<stdio.h>
#include<math.h>
int main()
{
    int i,j, k;
	double A[3][4] = {{2,8,2,14},{1,6,-1,13},{2,-1,2,5}};
	double x1,x2,x3;
	double m;
 
    for(i=0; i<2; i++)
	{
		for(j=i+1; i<3;j++)
		{
			m = A[j][i]/A[i][i];
			for(k=i; k<4;k++)
			{
				A[j][k] = A[j][k] - m*A[i][k];
			}
		}
	}
 
	x3 = A[2][3]/A[2][2];
		x2 = (A[1][3]-A[1][2]*x3)/A[1][1];
		x1 = (A[0][3]-A[0][1]*x2-A[0][2]*x3)/A[0][0];
 
	printf("x1=%lf	x2=%lf	x3=%lf \n",x1,x2,x3);
    return 0;
}

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