d-dmd, 184 bytes

Result

WA

Duration

559ms

Code [DL]

import std.stdio;void main(){int[30]a;for(int i;read(" %d",&a[i]);)a[i]-=a[i%3]*(i++>2);write=(a[3]*(a[7]*a[11]-a[8]*a[10])+a[4]*(a[8]*a[9]-a[11]*a[6])+a[5]*(a[10]*a[6]-a[7]*a[9]))/6;}

stdin

40 85 83
04 47 35
39 83 02
86 11 68

stdout

stderr

/volume/CODE.d(1): Error: undefined identifier `read`, did you mean function `fread`?
Failed: ["/usr/bin/dmd", "-v", "-o-", "/volume/CODE.d", "-I/volume"]

strace