Solution :
6xy – 4y + 6 – 9x
Rearranging the expression, as 6xy - 9x - 4y + 6
= 6xy - 9x - 4y + 6 [these are the two groups]
Common factor from 1st group = 3x
Common factor from 2nd group = - 2
= 3x( 2y - 3) - 2( 2y - 3)
Now there are two terms, take common binomial factor (2y - 3)
= (2y - 3) (3x - 2)