#include<stdio.h>
#include<math.h>
int main()
{
    int i,j,k;
	double A[3][4] = {{3,-1,2,12},{1,2,3,11},{2,-2,-1,2}};
	double E,x[10];
    for(i=1; i<=3; i++){
        for(j=1; j<=3; j++){
            if(i!=j){
                E = A[i][j]/A[j][j];
                for(k=1; k<=3; k++){
                    A[i][k] = A[i][k] - E*A[j][k];
                }
            }
        }
    }
    for(i=1; i<=3; i++){
        x[i] = A[i][3]/A[i][i];
        printf("\nx%d = %f\n",i,x[i]);
    }
    return 0;
}

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