Add the following terms:
$5 x y, - 2 x y, - 11 x y, 8 x y$

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Solution

$5 x y + (- 2 x y) + (- 11 x y) + 8 x y$
$= 5 x y - 2 x y - 11 x y + 8 x y$
$= (5 - 2 - 11 + 8) x y$ [Taking out the common variables]
$= (0) x y$
$= 0$
$∴ 5 x y + (- 2 x y) + (- 11 x y) + 8 x y = 0$

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