subtract 7xy+5yz-2zx from the sum of 4yz+9zx-4y and -3xz+5x-2xy
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Step-by-step explanation:
[(4yz+9zx-4y)+(-3xz+5x-2xy)] - 7xy+5yz-2zx
(4yz+6zx-4y+5x-2xy)-(7xy+5yz-2zx)
9yz+8zx-4y+5x-9xy
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