node, 149 bytes

Result

WA

Duration

582ms

Code [DL]

let[,,,a,b,c,d,e,f,g,h,i]=(""+require("fs").readFileSync(0)).split(/\s/).map((e,i,x)=>e/1-x[i%3])console.log((a*e*i+b*f*g+c*d*h-a*f*h-b*d*i-c*e*g)/6)

stdin

23 82 87
62 85 21
87 22 19
62 35 06

stdout

stderr

/volume/CODE:1
(function (exports, require, module, __filename, __dirname) { let[,,,a,b,c,d,e,f,g,h,i]=(""+require("fs").readFileSync(0)).split(/\s/).map((e,i,x)=>e/1-x[i%3])console.log((a*e*i+b*f*g+c*d*h-a*f*h-b*d*i-c*e*g)/6)
                                                                                                                                                               ^^^^^^^

SyntaxError: Unexpected identifier
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:599:28)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Function.Module.runMain (module.js:676:10)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

strace