please answer the question
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Answer:
Let the number added be 'a'
=> -7xy+3y² + a = -x²y²+5y²+2xy
=> a = -x²y²+5y²+2xy -(-7xy+3y²)
=> a = -x²y²+5y²+2xy +7xy-3y²
=> a = -x²y²+2y²+7xy
the required Answer is -x²y²+2y²+7xy
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