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Question
Add the following:
\[4xy - 5yz - 7zx\]
\[ - 5xy + 2yz + zx\]
- 2xy - 3yz + 3zx
_______________
Solution
\[4xy - 5yz - 7zx\]
\[ - 5xy + 2yz + zx\]
- 2xy - 3yz + 3zx
\[ - 3xy - 6yz - 3zx\]
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