Question
Simplify : $-(y-x)-(x+y-\overline{2 x+y})$

Answer

$-(y-x)-(x+y-\overline{2 x+y})$
$=-(y-x)-(x+y-2 x-y)$
$=-y+x-x-y+2 x+y$
$=x-x+2 x-y-y+y$
$=2 x-y$

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