Question

simplify( x - y )+ (Y - X )+( 2y - x)

Answer 1

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x-y+(y-x)+(2y-x)
=x-y+y-x+2y-x
=2y-x.

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Answer 2

( x- y) + (y - x ) + ( 2y - x)
= x - y +y -x + 2y -x
= 2y -x