find the sum of 2xy-yz-zx,2yz-zx-xy and 2zx-xy-yz
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2xy -yz-zx + 2yz-zx-xy + 2zx -xy-yz
2xy-xy-xy -yz+2yz-yz -zx -zx+2zx
2xy-2xy+2yz-2yz+2zx-2zx
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