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Let x,y,zx,y,zx,y,z be integers such that
xy+x+y=20zy+z+y=6xz+x+z=2xy+x+y=20\\ zy+z+y=6\\ xz+x+z=2xy+x+y=20zy+z+y=6xz+x+z=2
Given that x,y,z≠0x,y,z\neq 0x,y,z=0, find z−x−yz-x-yz−x−y
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