Ok so I don't know I can do them but sometimes I get one variable wrong but the other two are correct, maybe I'm mixing up the equations or numbers?
7x+5y+z=0
-x+3y=2z=-16
x-6y-z=-18
3x-5y+z=9
x-3y-2z=-8
5x-6y+3z=15
4x-3y+2z=12
x+y-z=3
-2-2y+2z=5
-x-3y+z=54
4x+2y-3z=-32
2y+8z=78