7xy + 6y - 5zx , -9yz + 3y , 3yz - 8xy
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Answer:
(7xy + 3yz - 5zx)+(-5xy - 2yz + 3zx)+(8xy + 4yz +8zx)
=7xy+3yz-5zx-5xy-2yz+3zx+8xy+4yz+8zx
=7xy-5xy+8xy+3yz-2yz+4yz-5zx+3zx+8zx
=15xy-5xy+7yz-2yz+6zx
=10xy+5yz+6zx
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