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a)5x, 2y, 1/2
b)8m, -7n, 4
c)-3a, -4b, -b
2.
a)6x+3y
3(2x+y)
b)8ab-2a+b
1(8ab-2a+b)
c)-6m+m-4n-mn
1(-6m+m-4n-mn)