Subtract x-2y-z from the sum of 3x -y+zand x+y-3z
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Answer:
sum of( 3x-y+z) +(x+y-3z) =
4x-2z
NOW (4x -2z) - (x-2y-z) =
4x-2z-x+2y+z=3x+2y-z
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