csharp, 344 bytes

Result

WA

Duration

739ms

Code [DL]

using System;
class Program
{
public static void Main(){
    string [] b = Console.ReadLine().Split(' ');
    int [] a= new int[16];
    for(int z=12;z>-1;z--)a[z]=int.Parse(b[z]);
    for(int z=9;z>-1;z--)a[z]-=a[9+z%3];
    System.Console.WriteLine( (a[7]*(a[3]*a[2]-*a[0]*a[5])+a[6]*(a[1]*a[5]-a[4]*a[2])+a[8]*(*a[0]*a[4]-a[3]*a[1]))/6);
}
}

stdin

47 94 76
75 50 98
19 03 06
82 17 55

stdout

Compilation failed: 2 error(s), 0 warnings

stderr

/tmp/code.cs(9,48): error CS0214: Pointers and fixed size buffers may only be used in an unsafe context
/tmp/code.cs(9,48): error CS0193: The * or -> operator must be applied to a pointer
Cannot open assembly '/tmp/code.exe': No such file or directory.
rm: can't remove '/tmp/code.exe': No such file or directory

strace