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{x+y+z=4
{x+2y+3z=9
x-y=0
x=y
y+y+z=4
x+2y+3z=9
x=y
2y+z=4
z=4-2y
x+2y+3z=9
y+2y+3×(4-2y)=9
3y+12-6y=9
-3y=9-12
-3y=-3/(-3)
y=1
x=y
x=1
z=4-2y
z=4-2×1
z=4-2
z=2