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b. 9m - 12m + 4mn- 7mn = (-3m) - 3 mn
f. 12kl - 5 kl - 20mn - 3 mn = 7kl - 23mn
b. m (9-15n)
c. -3a^2 + 5ab -11
d. -x^2 - xy + 3y
e. -10p^2 + 11pq - 5
f. 7kl - 23mn