Use Gaussian Elimination to find a solution to the given system or show that it is inconsistent?

x-3y-2z=2

3x-9y-9z=9

-x+4y+3z=3

This is a problem i have in the book and this is an (odd) question in which i have the answer too, which is x=18, y=6, z=-1. I really don't know how to do it. Can someone teach me or show me how they did it. I tried alot of times to get the answer but i still can't get the answer they got. Help Plzzz!