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=3x
B.-8p²+20pq+8p²
=20pq
C.-10p+15+7p
=-3p+15
D.-16-20b
A.2x-6y-4x+4y
=-2x-2y
B.pq-pr+qr-pq+rp-qr
=0
C.4a-4b-2a-2b-3a+6b
=-1a