Quick question about adding electrons w/ electrochemistry?

What determines the amount of electrons to be balanced on each side. I guess what im asking is what is the correct way of determining this when balancing an acidic equation.

Answer:
You add the electrons only at the very end to balance charge.

When you add two equations together (one oxidation and one reduction), you multiply the half-reactions through by constants so that the electrons will "zero out" in the net equation.
the answer above mine is indeed correct

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