add the following expressions using the horizontal method 8xy - 4yz + 3zx, 7xy + yz - zx and- 4xy - 7yz - 9zx
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8xy - 4yz + 3zx, 7xy + yz - zx and- 4xy - 7yz - 9zx
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Answer:
8xy - 4yz + 3zx, 7xy + yz - zx and- 4xy - 7yz - 9zx
= 11xy -10yz -7zx
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