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=2X+3Y+4X-2Y
=6X+Y
2. A. 4b + 5a - 7b - 2a - 3b
= -6b + 3a
B. 3p + 2q + 1 - 2p + 4q + 6
= p + 6q + 7
= (2x+4x)+(3y-2y)
= 6x + y
4b + 5a -7b -2a -3b
= (4b-7b-3b) + (5a-2a)
= -6b + 3a = 3a - 6b
3p + 2q + 1 - 2p + 4q + 6
= (3p-2p) + (2q+4q) + (1+6)
= p + 6q + 7