add:7xy+5yz+3zx,4yz+9zx-4y,3xz+5x-2xy
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20
7xy-2xy+5yz+4yz+3xz+9xz+3xz+5x-4y
5xy+9yz+15xz+5x-4y answer
5xy+9yz+15xz+5x-4y answer
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16
Answer:
5xy+9yz+3xz-4y+5x is answer dear friend
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