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## Main Question or Discussion Point

The numerical answer is easy to find, but I'm wondering which units are in the answer and how those units are determined. Thanks in advance.

(6.63E-34 J×s)(7.09E14 s) - 2.17E-19 J =

(6.63E-34 J×s)(7.09E14 s) - 2.17E-19 J =