tolong di jawab ya pake caranyanya kak

x + 2y-3z = -4.....(1)
2x-y+z =3............(2)
3x +2y+z =10.......(3)
pers (1) dan (2)
x + 2y -3z = -4 | 2|2x+ 4y -6z = -8
2x -y +z = 3 | 1| 2x -y + z = 3
-------------------------------------- -
5y + 7z = 12....(4)
pers (1) dan (3)
x + 2y -3z = -4 | 3| 3x + 6y - 9z =- 12
3x + 2y +z = 10 | 1| 3x + 2y + z = 10
----------------------------------------------- -
4y + 10z = 22..(5)
pers (4) dan (5)
5y + 7z = 12 | 4 | 20y + 28z = 48
4y + 10z 22 | 5| 20y + 50z = 110
------------------------ -
-22 z = -62
z =