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Question
Simplify:
x − (y − z) + x + (y − z) + y − (z + x)
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Solution
x − (y − z) + x + (y − z) + y − (z + x)
= x − y + z + x + y − z + y − z − x
= x + x − x − y + y + y + z − z − z
= x + y − z
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