Set up a system belw as a matrix multiplication of the form AB=C. Find the inverse A^-1 of A and use it to solve the system.

3x + -6y + -17z = 288

11x + -17y + 110z = 79

-5x + 7y + 8z = 20.

I am able to get the first part of the matrix but I get lost when it comes to working on the second row.