Find the sum of: 4xy – 5yz – 9zx , 3zx – 2xy and -7yz + 2zx.
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Answer:
4xy-2xy-5yz-7yz-9zx+3zx+2zx
2xy-12yz-9zx+5zx
2xy-12yz-4zx
Step-by-step explanation:
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