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xxx and yyy are positive integers which satisfy:
4x2−y2=3154x^2-y^2=3154x2−y2=315
Suppose all of its solution can be stated in the form (x,y)=(xi,yi) (x,y) = (x_i, y_i) (x,y)=(xi,yi).
What is the value of ∑yi−∑xi \sum y_i - \sum x_i ∑yi−∑xi?
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