bash-busybox, 79 bytes

Result

WA

Duration

556ms

Code [DL]

wget https://raw.githubusercontent.com/taiyoslime-sandbox/wget/master/hoge -O -

stdin

74 52 54
59 45 38
02 31 72
01 70 14

stdout

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]

stderr

Connecting to raw.githubusercontent.com (151.101.72.133:443)
-                    100% |*******************************|   172   0:00:00 ETA

strace