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Mathematics 7 Online
OpenStudy (anonymous):

7xy - 2xz + 4xz - 12xyz + 2zx

OpenStudy (gw2011):

If you are trying to simplify this problem, then combine like terms. The like terms are: -2xz+4xz+2xz=4xz. Now you get : 7xy+4xz-12xyz

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