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-3a² + 5ab -11
d. 4x² - 3xy + 7y - 5x² + 2xy - 4y
-x² - xy + 3y
e. -4p² + 3pq - 2 - 6p² + 8pq - 3
-10p² + 11pq - 5
f. 12kl - 20mn - 5kl -3mn
7kl - 23mn