vim, 189 bytes

Result

WA

Duration

513ms

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  2b 33 5d 2d 3d 6c 5b 69  |.let l[i+3]-=l[i|
00000050  25 33 5d 0a 65 6e 64 66  6f 72 0a 67 67 56 47 63  |%3].endfor.ggVGc|
00000060  12 3d 2d 28 6c 5b 31 31  5d 2a 28 6c 5b 37 5d 2a  |.=-(l[11]*(l[7]*|
00000070  6c 5b 33 5d 2d 6c 5b 34  5d 2a 6c 5b 36 5d 29 2b  |l[3]-l[4]*l[6])+|
00000080  6c 5b 31 30 5d 2a 28 6c  5b 33 5d 2a 6c 5b 38 5d  |l[10]*(l[3]*l[8]|
00000090  2d 6c 5b 35 5d 2a 6c 5b  36 5d 29 2b 6c 5b 39 5d  |-l[5]*l[6])+l[9]|
000000a0  2a 28 6c 5b 34 5d 2a 6c  5b 38 5d 2d 6c 5b 37 5d  |*(l[4]*l[8]-l[7]|
000000b0  2a 6c 5b 35 5d 29 29 2f  36 0a 1b 5a 5a           |*l[5]))/6..ZZ|
000000bd

Disassembly

VGJ:let l=map(split(getline(1),' '),'str2nr')<NL>:for i in range(9)<NL>let l[i+3]-=l[i%3]<NL>endfor<NL>ggVGc<C-R>=-(l[11]*(l[7]*l[3]-l[4]*l[6])+l[10]*(l[3]*l[8]-l[5]*l[6])+l[9]*(l[4]*l[8]-l[7]*l[5]))/6<NL><Esc>ZZ

stdin

04 04 07
96 50 77
07 70 67
15 44 67

stdout

-91330

stderr

strace