add the following polynomials
9x-5y;4x+5y;8x-7y
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Answer:
(9x - 5y) + (4x + 5y) + (8x - 7y)
9x - 5y + 4x + 5y + 8x - 7y
9x + 4x + 8x - 5y + 5y - 7y
21x - 7y
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