stuck, 140 bytes

Result

WA

Duration

509ms

Code [DL]

ssss' j1r;:"s:[s[i+4]-s[i%3+1]for i in range(9)]"m"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

15 85 33
87 25 29
33 09 95
39 19 49

stdout

stderr

Traceback (most recent call last):
  File "stuck.py", line 167, in <module>
    main()
  File "stuck.py", line 162, in main
    process(prog, stack=[], t=0, nest=0)
  File "stuck.py", line 55, in process
    stack = plugins[plugin].CMDS[char](stack)
  File "plugins/stuck_base.py", line 80, in map_
    return s + [map(eval('lambda '+la),l)]
  File "<string>", line 1, in <lambda>
TypeError: 'int' object has no attribute '__getitem__'

strace