将x+3y=5y,y-2z=5,x+z=5,

问题描述:

将x+3y=5y,y-2z=5,x+z=5,

x=2y
y-2z=5
2y+z=5
y-2z=2y+z
y=-3z
-3z-2z=5
z=-1
y=3
x=6