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  #include "stdio.h" 
  #include "agrad.c" 
  #include "brmul.c" 
  main() 
  { int i; 
    double eps,x[4]; 
    static double a[4][4]={{5.0,7.0,6.0,5.0}, 
                           {7.0,10.0,8.0,7.0}, 
                           {6.0,8.0,10.0,9.0}, 
                           {5.0,7.0,9.0,10.0}}; 
    static double b[4]={23.0,32.0,33.0,31.0}; 
    eps=0.000001; 
    agrad(a,4,b,eps,x); 
    printf("\n"); 
    for (i=0; i<=3; i++) 
       printf("x[%d]=%e\n",i,x[i]); 
    printf("\n"); 
  }