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Omni-MATH / For how many pairs of nonzero integers (c,d) with −2015≤c,d≤2015 do the equations cx=d and dx=c both have an integer solution? · Discussion

Discussing For how many pairs of nonzero integers (c,d) with −2015≤c,d≤2015 do the equations cx=d and dx=c both have an integer solution? · Omni-MATH

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