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a.-6x
b.-2x
3.-9xy-3x
d.-6x-12y
e.-y+x
f.-3xy-4z
g.-5m-7n
h.-10x-3y
i.-4z
j.-8x-3y
k.-9a-15b
l.-4z+9zy2-15xy2
m.--7x+9xy+y
n.-5m-7mn+12n
o.--m-2mn+12m2n