x is the only thing those three terms have in common.
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That's 35 - 30x. The GCF of 35 and 30x is 5.
The GCF is 15x.
The GCF of anything compared to itself is itself.
The GCF is 2xy.
While I'm not exactly sure what 30 exponent x is, it sounds like one term. You need at least two terms to find a GCF.