zz=xx+4yy-2x+8y+4z

9zz-2xx-3y-3x+5=0

5xx-yy-zz-2x+2z+3y=0

-3xx+2y-3x+2y+zz=0

xx+5yy-2x+10y=zz

2xx+3yy-y-2=0

-3xx+2yy+2y-3x+z=0

18xx+9yy-4zz=0

16xx-9yy-zz=146

xx+4yy-zz=0

zzyy+zzxx=4

xx=yy-zz