.Add 8xy -2xz-3yz, 2zx -4y+9xy, 4xy+5x+2zx
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Explanation:
= 8xy-2xz-3yz+2zx-4y+9xy+4xy+5x+2zx
= 8xy+9xy+4xy-2xz+2zx+2zx+5x-4y-3yz
= 5x-4y+21xy+2zx-3yz
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