stuck, 163 bytes

Result

AC

Duration

507ms

Code [DL]

ssss["x:map(int,x.split())"mT"x:[x[3]-x[i] for i in range(3)]"mT]u]u]u][["x:(x[1]*(x[5]*x[6]-x[3]*x[8])+x[2]*(x[3]*x[7]-x[4]*x[6])+x[0]*(x[4]*x[8]-x[5]*x[7]))/6"m]

stdin

99 63 18
48 07 22
27 59 68
45 81 04

stdout

40774

stderr

strace