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b. 9m-12m+4mn-7mn= -3m-3mn
c. 2a²-5a²+3ab+2ab-7-4= -3a²+5ab-11
d. 4x²-5x²-3xy+2xy+7y-4y = -x²-xy+3y
e. -4p²-6p²+3pq+8pq-2-3= -10p²+11pq-5
a.
b.
c.
d.
e.
f.
g.
h.
i.