10xy+7yz+11zxfrom12xy+4yz-3zx-7xyz
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10xy+7yz+11zx from 12xy+4yz-3zx-7xyz
= 12xy+4yz-3zx-7xyz - (10xy+7yz+11zx)
= 12xy+4yz-3zx-7xyz - 10xy-7yz-11zx
= 12xy - 10xy +4yz -7yz -3zx -11zx-7xyz
= 2xy -3yz -14zx-7xyz
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