Nilai x+y+z dari persamaan 2x+3y+z=6 3x+2y+z=7 x+2y+z=5 Tolong dijawab terimakasih

2x+3y+z=6........ (1)
3x+2y+z=7..........(2)
x+2y+z=5.........(3)

3x+2y+z=7..........(2)
x+2y+z=5.............(3)
________ -
2x = 2
x = 1

2x+3y+z=6........(1)
x+2y+z=5.......(3)
______________ -
3y+z = 6-2
2y+z = 5-1

3y+z = 4
2y+z = 4
________ -
1y = 0
y= 0

x+2y+z=5.............(3)
1+2(0)+z= 5
1+0+z= 5
1+z = 5
z = 5-1
z= 4

x+y+z
1+0+4
5