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= 15kl-9kl-5mn-3mn
= 6kl-8mn
b. -2p²+3pq-14-3p²+6pq-35
= -2p²-3p²+3pq+6pq-14-35
= -5p²+9pq-49
5mn-3mn=2mn
=6+2=8
b. -2p2-3p2+3pq+6pq-14-35
=-5p2+9pq-49