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