add 7xy +5yz‐3zx & 4xy+ 9zx‐4xy
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Answer:
7xy+6zx+5yz
Step-by-step explanation:
7xy+5yz-3zx+4xy+9zx-4xy
7xy+4xy-4xy-3zx+9zx+5yz
7xy+6zx+5yz
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