vim, 190 bytes

Result

WA

Duration

520ms

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 0d 0a 3a  | '),'str2nr')..:|
00000030  66 6f 72 20 69 20 69 6e  20 72 61 6e 67 65 28 39  |for i in range(9|
00000040  29 0d 0a 6c 65 74 20 6c  5b 69 2b 33 5d 2d 3d 6c  |)..let l[i+3]-=l|
00000050  5b 69 25 33 5d 0d 0a 65  6e 64 66 6f 72 0d 0a 43  |[i%3]..endfor..C|
00000060  12 3d 28 6c 5b 33 5d 2a  28 6c 5b 37 5d 2a 6c 5b  |.=(l[3]*(l[7]*l[|
00000070  31 31 5d 2d 6c 5b 38 5d  2a 6c 5b 31 30 5d 29 2b  |11]-l[8]*l[10])+|
00000080  6c 5b 34 5d 2a 28 6c 5b  39 5d 2a 6c 5b 38 5d 2d  |l[4]*(l[9]*l[8]-|
00000090  6c 5b 31 31 5d 2a 6c 5b  36 5d 29 2b 6c 5b 35 5d  |l[11]*l[6])+l[5]|
000000a0  2a 28 6c 5b 36 5d 2a 6c  5b 31 30 5d 2d 6c 5b 37  |*(l[6]*l[10]-l[7|
000000b0  5d 2a 6c 5b 39 5d 29 29  2f 36 0d 0a 5a 5a        |]*l[9]))/6..ZZ|
000000be

Disassembly

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

stdin

44 50 42
62 02 14
09 27 69
44 35 03

stdout

44 50 42
62 02 14
09 27 69
44 35 03

stderr

strace