The least common factor of any set of numbers is 1.
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The GCF is 3xy.
Since 3x is a factor of 3x^2, it is automatically the GCF.
The GCF is 3x
3x
6x - 2y + 3xz - yz = (z + 2)(3x - y) 9x - 3y = 3(3x - y) (3x - y) over (3x - y) equals 1, so they can be canceled out. The simplified expression is (z + 2) over 3.