add the following - 7xy + 2yz + 4zx and 3xy + 6zx + 9yz
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Answer:
(-7xy + 2yz + 4zx) + (3xy + 6zx + 9yz)
Step-by-step explanation:
-7xy + 2yz + 4zx + 3xy + 6zx + 9yz
=> -4xy + 11yz + 10zx
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