It is not possible to be certain about it being the "greatest" common factor, because 2 or 3 or 6 may be a factor of x, but the general solution for practical purposes is: 11x = 11*x and -66 = 11*(-1)*2*3 so [g]cf is 11.
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The GCF of 30 and 66 is 6.
22 is the GCF of 66 and 22.
The GCF of 66 and 88 is 22.The GCF of 88 and 66 is 22
The GCF is 11.
The GCF is 6.