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b. 9m - 12m - 7mn + 4mn = - 3m - 3mn
c. 2a^2 - 5a^2 + 2ab + 3ab - 4 - 7 = -3a^2 + 5ab - 11
d. 4x^2 -5x^2 + 2xy - 3xy - 4y+7y = - x^2 -xy + 3y
e. -4p^2 - 6p^2 + 3pq + 8pq - 2 - 3 = -10p^2 + 11pq -6
f. 12kl - 5kl-20mn-3mn = 7kl - 23mn
b. -3m -3mn
c. -3a^2 +5ab -11
d. -x^2 +xy -3y
e. -10p^2 +11pq -5
f. -7kl -23mn