tolong bantu ya, ga ngerti cara ngerjainnya

x+z=2y. z = 2y-xpersamaan ke 1
x+y+z=6. persamaan ke 2
2y + y = 6
3y = 6
y = 6:3
y = 2
x-y+2z = 5
x-y+2(2y-x) = 5
x-y+4y-2x = 5
-x+3y = 5
-x +3.2 = 5
-x + 6 = 5
-x = 5-6
-x = -1
x= 1
z = 2y-x
z= 2.2-1
z=4-1
z = 3
semoga membantu :')