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b)-4x+3y-x-y+2y=-5x+4y
c)-2a+b+3a-5b+4a+b=5a-3b
d)-6x+4x-2y-6=-2x-2y-6
e)2x+9y+1-5x+4y+5=-3x+5y-6
f)-3a-1+2a-1-4a-4=-5a-6
g)2x+2y-x-y+x-2y=2x-y
h)-2a+3b+5a-4b-2a=a-b
i)3x+3
j)-4x+6
k)-12x+8
l)4x+2y
m)2a²-3a
n)3ab-b
o)-6a+2b+6a-9b=-7b
p)16a-24b-2a+5b=14a-19b