Tentukan Himpunan Penyelesaian dari 2x - y + z = 12 x + 2y + z = 5 3x -y + 2z = 19 Tolong dijawab ya kakak. Urgent sekali :(

2x-y+z=12
Z=12-2x+y

X+2y+z=5
X=5-2y-z
X=5-2y-(12-2x+y)
X=-7-3y+2x
X=7+3y

Z=12-2x+y
Z=12-2(7+3y)+y
Z=-2-5y

3x-y+2z=19
3(7+3y)-y+2(-2-5y)=19
21+9y-y-4-10y=19
17-2y=19
Y=-1

X=7+3y
X=7-3=4

Z=-2-5y
Z=-2+5=3