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crackgmat007
- Legendary Member
- Posts: 882
- Joined: Fri Feb 20, 2009 2:57 pm•Followed by: 1 member
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- GMAT Score:690
xy + z = xy + xz
xy - xy = xz - z
0 = z(x-1)
therefore z can be equal to 0 or x can be equal to 1
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z=0?
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