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You usually swap the sign of the equation that needs to be oxidized. Since the back of the book only lists reduction potentials, and a redox reaction has both reduction and oxidation half reactions, we need to flip one of the equations to turn it into an oxidation. Turning a half reaction from a reduction to an oxidation basically means you are reversing the equation, in which case you need to change the sign of E naught.
Yeah I also do what Ridhi does which is flipping the sign of the oxidation reaction since the appendix contains the reduction potentials. Either way works though, it all just depends on what way works best for you.
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