csharp, 289 bytes

Result

WA

Duration

845ms

Code [DL]

using System;using System.Linq;class A{static void Main(){
char[]c={' ','\n'};
int[]a=Console.In.ReadToEnd().Split(c).Take(12).Select(Int32.Parse).ToArray();
int s=0,p=0,q=0;
for(int z=9;z-->0;a[z%9]-=a[9+z%3],s+=a[z%3]*=a[p=3+(z+1)%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]);
Console.Write(s/6);
}}

stdin

94 18 68
74 73 17
01 06 46
21 59 33

stdout

-318436467

stderr

strace