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2x (z − x − y) and 2y (z − y − x)

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First expression = 2x (z − x − y) = 2xz − 2x2 − 2xy Second expression = 2y (z − y − x) = 2yz − 2y2 − 2yx Adding the two expressions, we obtain

Therefore, the sum of the given expressions is − 2x2 − 2y2 − 4xy + 2yz + 2zx.

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