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The Greatest Common Factor (GCF) refers to a factor that is COMMON to two or more numbers. A single number cannot have a greatest common factor.
In fact, the above expression has no real factors. And if you were studying mathematics at a level where you knew about complex factors, you would know that the GCF for a single expression or number makes no sense.
If that was d^2 - d - 42, it would factor into (d + 6)(d - 7)
As it is, the roots are imaginary. Either way, you need at least two terms to find a GCF.