add 7xy+5z-3zx,4yz+9zx-4,-+5x-2xy
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Step-by-step explanation:
7xy+5z-3zx+4yz+9zx-4+5x-2xy
5x-2xy+7xy+4yz+5z-3zx+9zx-4
5x+5xy+4yz+5z+6zx-4.
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