subtract 7xy+5yz-3zx from 4yz+9z×-4y
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= 4yz + 9z × -4y - 7xy + 5yz - 3zx
= 4yz - 36yz - 7xy + 5yz - 3zx
= -32yz + 5yz - 7xy - 3zx
= -27yz - 7xy - 3zx
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