cy, 79 bytes

Result

AC

Duration

1415ms

Code [DL]

"\\#{require'matrix';b=$<.map{|x|x.split.map(\&:to_i)<<1};p -Matrix[*b].det/6}"

stdin

64 63 65
17 92 06
94 49 79
31 04 82

stdout

12644

stderr

strace