Revert "o mv uexArithmetic.X arithmetic.X"

history was not preserved.

This reverts commit fd9670bdeda2ecaa49f7f6c53b3d7f89e739dc83.
Revert "o mv uexArithmetic.X arithmetic.X"

history was not preserved

This reverts commit f1e29ac5e2e634109f35632fc6c14fccfce821a4.