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A quality control technician is evaluating the thermal expansion of a machined part and needs to simplify the expression (4+57)(457)({}4 + 5\sqrt{7})({}4 - 5\sqrt{7}) to find the differential coefficient. Recalling the Product of Conjugates pattern, (a+b)(ab)=a2b2(a+b)(a-b) = a^2 - b^2, the technician evaluates the square of the first term as 16 and the square of the second term as 175. The final simplified integer value for the coefficient is ____.

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