' Equation 2 tells us that the greatest common divisor of the integers x and y is 1 comma and so 1 can be written as a linear combination of x and y. I would add a comma as shown, to help the reader grasp the structure of the sentence. I take your meaning to be that the second part is the conclusion you draw from the fact that Equation 2 tells us that the greatest common divisor of the integers x and y.
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