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By convention in writing out cell diagrams, the anode is typically on the left side and the cathode is typically on the right side. So, the standard cell potential would be the potential of the cathode minus the potential of the anode. You can tell if the left or right side is the cathode or anode based on the cell potential being positive or negative if you subtract the right side minus the left side.
The potential difference between electrodes is usually done by subtracting the left (anode, oxidation half reaction) from the right (cathode, reduction half reaction). If the result is positive, that means electrons are flowing from the left to the right, from the anode to the cathode, which is usually the case.
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