(7xy+5yz)+(4yz+9zx-4y)+(-3xz+5x-2xy-3zx) =
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Answer:
=(7xy+5yz−3zx)+(4yz+9zx−4y)+(−3xz+5x−2y)
=7xy+5yz−3zx+4yz+4zx−4y−3xz+5x−2y
=7xy+9yz+3zx+5x−6y
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