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There is no solution : since X_1^2==4 and X_2^2==4, then both X_1 and X_2 are even integers, hence it is not possible that X_1*X_2==1.

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No.2 Revision

There Even on Linux there is no solution : since X_1^2==4 and X_2^2==4, then both X_1 and X_2 are even integers, hence it is not possible that X_1*X_2==1.