From the sum of x+y-2z and 2x-y+z subtract x+y+z.
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Step-by-step explanation:
(x+y-2z)+(2x-y+z)
=(x+2x+y-y-2z+z)
=(3x-z) == Sum
Now, subtract x+y+z from 3x-z
=(3x-z)-(x+y+z)
=3x-z-x-y-z
=2x-y-2z......Answer
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