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-1 mn + -8m
b) -7p²+3p²+4pq-pq-6-9
-4p² +3pq -15
= 5m-13m+7mn-8mn
=-8m-mn
b. -7p²+4pq -6+ 3p²- pq - 9
=-7p²+ 3p²+4pq-pq -6 -9
=-4p²+3pq-15