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b. 9mn+4mn-7mn-12m = 6mn-12m
c. 2a²-5a²+3ab+2ab-7-4 = -3a²+5ab-11
d. 4x² -5x² -3xy +2xy +7y -4y = -1x² -1xy +3y
e. 12kl-5kl-20mn-3mn = 7kl -23mn
sori kalau kurang jelas ;3 smoga membantu