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Question
Subtract the sum of x + y and x – z from the sum of x – 2z and x + y + z
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Solution
(x − 2z) + (x + y + z) − {(x + y) + (x − z)}
= x − 2z + x + y + z − {x + y + x − z}
= x − 2z + x + y + z − x − y − x + z
= x + x − x −x + y − y + z + z − 2z
= 0
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