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Yes, you have to cancel out the electrons on both sides. Most times you'll have to multiply at least one of the half reactions in order to get the same amount of electrons on each side to be able to cancel them out.
We haven't talked much yet about properly balancing half-reactions, but I know that there are a lot more steps involved, such as adding H2O to balance any oxygens and adding H+ to balance any hydrogens. The number of electrons you add should be to properly balance the charges on both sides, and yes the number of electrons for each half-reaction should equal each other (you can multiply one half-reaction by a certain factor to get them to equal each other) so that they cancel out. Prof Lavelle might discuss this further (or not!) so I wouldn't worry too much about it!
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