UPSKILL MATH PLUS

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Add and simplify the expression:
 
p(x) = xy^2 + 54x^2y - 81x^2y - 36xy^2 + 36 and q(x) = x^2y + xy^2.
 
The simplest form of the added expression = iixy2iix2yii.
 
(Note: Insert the answer with the sign and the number in separate boxes as per the given order).
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