6. Subtract 4xy+5yz-7xz from 8xy - 4yz + 3xz.
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Subtracting 8xy+4yz+5zx from 12xy−3yz−4zx+5xyz, we have
(12xy−3yz−4zx+5xyz)−(8xy+4yz+5zx)
= 12xy−3yz−4zx+5xyz−8xy−4yz−5zx
= 4xy−7yz−9zx+5xyz
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