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a)
4a+3b+2
7a+2b-4
6x+t+6y+7
x+3y-26z
b+c+6d
b)
7a-2b-1
2a-6b+8c
4u-w-3v
9u-4w+v
x-2y+z
3.
a)
8a+4a-7= 12a-7
b)
5a-3a-6=2a-6
c)
-8m+2n-m=-9m+2n
d)
-3p-6r+4p = p-6r
e)
2x-7y+5x-2y=7x-9y
f)
-2x+8y-6x+7y=15y-8x
g)
3u-6v+6v-5=3u-5
h)
8u+3v-2u-5v=6u-2v
i)
-a-4b+5b-a=-2a+b
j)
7a-b-4a+2b= b+3a