(3q + 7p2 - 2r + 4) - (4p2 - 2q + 7r - 3)
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(3q + 7p² - 2r + 4) - (4p² - 2q + 7r - 3)
= 3q + 7p² - 2r + 4 - 4p² + 2q - 7r + 3)
= 7p² - 4p² + 3q + 2q - 2r - 7r + 4 + 3
= 3p² + 5q - 9r + 7
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please check attached pic
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