vim, 183 bytes

Result

WA

Duration

517ms

Code [DL]

00000000  56 47 4a 3a 6c 65 74 20  6c 3d 6d 61 70 28 73 70  |VGJ:let l=map(sp|
00000010  6c 69 74 28 67 65 74 6c  69 6e 65 28 31 29 2c 27  |lit(getline(1),'|
00000020  20 27 29 2c 27 73 74 72  32 6e 72 27 29 0a 3a 66  | '),'str2nr').:f|
00000030  6f 72 20 69 20 69 6e 20  72 61 6e 67 65 28 39 29  |or i in range(9)|
00000040  0a 6c 65 74 20 6c 5b 69  5d 2d 3d 6c 5b 39 2b 69  |.let l[i]-=l[9+i|
00000050  25 33 5d 0a 65 6e 64 66  6f 72 0a 63 63 12 3d 28  |%3].endfor.cc.=(|
00000060  6c 5b 38 5d 2a 28 6c 5b  34 5d 2a 6c 5b 30 5d 2d  |l[8]*(l[4]*l[0]-|
00000070  6c 5b 31 5d 2a 6c 5b 33  5d 29 2d 6c 5b 37 5d 2a  |l[1]*l[3])-l[7]*|
00000080  28 6c 5b 30 5d 2a 6c 5b  35 5d 2d 6c 5b 32 5d 2a  |(l[0]*l[5]-l[2]*|
00000090  6c 5b 33 5d 29 2b 6c 5b  36 5d 2a 28 6c 5b 31 5d  |l[3])+l[6]*(l[1]|
000000a0  2a 6c 5b 35 5d 2d 6c 5b  34 5d 2a 6c 5b 32 5d 29  |*l[5]-l[4]*l[2])|
000000b0  29 2f 36 0a 1b 5a 5a                              |)/6..ZZ|
000000b7

Disassembly

VGJ:let l=map(split(getline(1),' '),'str2nr')<NL>:for i in range(9)<NL>let l[i]-=l[9+i%3]<NL>endfor<NL>cc<C-R>=(l[8]*(l[4]*l[0]-l[1]*l[3])-l[7]*(l[0]*l[5]-l[2]*l[3])+l[6]*(l[1]*l[5]-l[4]*l[2]))/6<NL><Esc>ZZ

stdin

49 27 33
89 31 71
45 91 08
07 16 86

stdout

-38924

stderr

strace