bash-busybox, 172 bytes

Result

WA

Duration

478ms

Code [DL]

read j k l
read a b c
read d e f
read g h i
a=$[a-j];b=$[b-k];c=$[c-l]
d=$[d-j];e=$[e-k];f=$[f-l]
g=$[g-j];h=$[h-k];i=$[i-l]
echo $[(a*e*i+b*f*g+c*d*h-a*h*f-b*i*d-c*g*e)/6]

stdin

63 49 09
31 49 02
86 42 80
36 66 82

stdout

10382

stderr

/volume/CODE: line 5: 09: value too great for base (error token is "09")
/volume/CODE: line 6: 09: value too great for base (error token is "09")
/volume/CODE: line 7: 09: value too great for base (error token is "09")

strace