Ok, I'm embarrased to even post this but this is 3rd grade pre-algebra...
The question is to find the common factor.
Here is the question:
7 x _ = 2 x _
I was assuming 7 x 2 = 2 x 7
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yeah that looks fine to me. If both blanks must be the same number then you must use zero for both blanks. but in general the greatest common factor of 2 and 7 is 1 since they're both prime.