Yes, it can.
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If that's +28, the answer is (x - 4)
Divide the numerator by the GCF.Divide the denominator by the GCF.Done.
Yes, if they are in common for all the terms.
When you divide 2 or more numbers by a common factor which is not the greatest common factor, they will still have a common factor which is greater than 1. When you divide them by their greatest common factor, the quotients are coprime - that is, they no longer have a factor in common other than 1.
As a general principle, you can find the LCM of two numbers by dividing their product by their GCF. This one won't work. The product of any two numbers with 5 as a common factor would have to end in 5 or 0.