Subtract 7xy + 5yz -- 3zx from 4yz + 9zx - 4y
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4yz+9zx-4y-(7xy+5yz-3zx)
4yz+9zx-4y-7xy-5yz+3zx
4yz-5yz+9zx+3zx-4y-7xy
-yz+12zx-4y-7xy
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