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A. 3a-5a+2b-4 = -2a+2b-4
B. -x+2x+2y-y = x+y
C. 5x-x+4y-2y = 4x+2y
D. 6a²-2ab-3a²+b
=6a²-3a²-2ab+b
=3a²-2ab+b
E. gaktau (maap)
F. ab+2ab-c²+2c² = 3ab+c²