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.