Try another version of this question Solve the System. Give answer as `(x,y,z)`. Get help: Box 1: Enter your answer as an n-tuple of numbers. Example: (2,5.5172)
`{(3x-5y-6z = 28),(6x+5y+5z = 9),(-12x+5y-z = -57):}`
`(x,y,z)=`
Enter DNE for Does Not Exist `(4,-2,-1)`