(2p² - 7pq + 1) - (4p² + 2pq - 6)
= 2p² - 7pq + 1 - 4p² - 2pq + 6
= 2p² - 4p² - 7pq - 2pq + 1 + 6
= -2p² - 9pq + 7 (answer)
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(2p² - 7pq + 1) - (4p² + 2pq - 6)
= 2p² - 7pq + 1 - 4p² - 2pq + 6
= 2p² - 4p² - 7pq - 2pq + 1 + 6
= -2p² - 9pq + 7 (answer)