add 2x (z-x-y-) and 2y (z-y-x)
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Step-by-step explanation:
2x(z−x−y)+2y(z−y−x)
2xz−2x
2
−2xy+2yz−2y
2
−2xy
−2x
2
−2y
2
−4xy+2yz+2xz
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