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Question
From the sum of x + y – 2z and 2x – y + z subtract x + y + z.
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Solution
(x + y − 2z) + (2x − y + z) − (x + y + z)
= x + y − 2z + 2x − y + z − x − y − z
= x + 2x − x + y − y − y − 2z − z + z
= 2x − y − 2z
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