{2x+2y=4z 1/2x+1/2y=z 92x+92y=184z
{x+y+z=3{x-z-y=-1{x+y-z=1
x+y+z=3x-y+z=1x-y-z=-1
x+y+z=32x-y+z=25z-y-x=3