6(ab - ac + b2 - bc)
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With the assumption your asking what a or b are in terms of each other. a=3b/(6b-2) b=2a/(6a-2)
This has a degree of 2.
Since 3a is a factor of 6ab, it is automatically the GCF.
6a^2 - 6ab + 7a^2 = 13a^2 - 6ab = a * (13a - 6b)
(6ab + 9b)/(2a + 3) = 3b(2a + 3)/(2a + 3) = 3b
The GCF is 6ab