subtract 7xy+5yz-2zx from the sum of 4yz+9zx-4y and -3xz+5x-2xy
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(4yz+9zx-4y + -3xz+5x-2xy) - (7xy+5yz-2zx)
= (4yz-2xy+6xz+5x-4y) -7xy-5yz+2xz
= 4yz-5yz-2xy-7xy+6xz+2xz+5x-4y
= -yz-9xy+8xz+5x-4y
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