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b. 2(2x+3y)+3(4x-2y)
4x+6y+12x-6y = 16x
c. (2x+3y)+2(4x-2y)-5(2x+3y) = 2x+3y+8x-4y-10x-15y = -16y
= (2x+3y)-(4x-2y)
= 2x+3y-4x+8y
= -2x+11y
2p+3q
= 2(2x+3y)+3(4x-2y)
= 4x+6y+12x-6y
= 16x
p+2q-5p
= (2x+3y)+2(4x-2y)-5(2x+3y)
= 2x+3y+8x-4y-10x-15y
= -16y